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Le novità e Miglioramenti nella versione 19.6.03

New features including:

• A new graphical user interface featuring a ribbon bar which makes it easy to find the analysis you want to use and the controls to select options.
• An interface to Python, with facilities for exchanging data, executing scripts, and accessing libraries such as the K-means clustering procedure.
• Over a dozen new statistical procedures, including equivalence analysis and noninferiority testing for variances, quantile regression, piecewise linear regression, zero-inflated Poisson and negative binomial regression, fitting mixtures of univariate and bivariate normal distributions, machine learning procedures such as decision forests, waterfall plots, and Venn and Euler diagrams.
• New alias optimal designs in the DOE Wizard, together with a feature for selecting optimal runs to enhance an existing design.
• A dashboard that indicates the status of selected procedures such as control charts and capability indices.

User Interface

Selection of options and procedures is now controlled by a ribbon bar and quick access toolbar.

The ribbon bar makes it easy to find the feature you’re looking for, while the quick access toolbar lets you bypass the menus when using your favorite procedures.

Analysis windows now let you switch between multi-pane and single pane modes. As in earlier versions, multi-pane mode puts each table and graph in a separate pane of a splitter window.

Single pane mode combines all output into a single report-style format.

As can be seen above, output tables now have modifiable column and row headers that may be displayed using selectable colors and other features.

Dashboard

A new Dashboard has been added to the set of StatFolio windows that can display tables and graphs from different analyses side-by-side. For procedures such as control charts, capability analyses, regressions, stock charts and measurement studies, the background of a table or graph can be colored green, yellow or red to indicate the status of selected indices, large changes or unusual residuals.  Watch Video

Univariate Mixture Distributions

The Distribution Fitting (Univariate Mixture Models) procedure fits a distribution to continuous numeric data that consists of a mixture of 2 or more univariate normal distributions. The components of the mixture may represent different groups in the sample used to fit the overall distribution, or the mixture model may approximate some distribution with a complicated shape. The procedure fits the distribution, creates graphs, and calculates tail areas and critical values. Tools are provided for determining how many components are needed to represent a data sample.   Watch Video

Bivariate Mixture Distributions

The Distribution Fitting (Bivariate Mixture Distributions) procedure fits a distribution to continuous numeric data that consists of a mixture of 2 or more bivariate normal distributions. The components of the mixture may represent different groups in the sample used to fit the overall distribution, or the mixture model may approximate some distribution with a complicated shape. The procedure fits the distribution and creates graphs of the fitted model. Tools are also provided for determining how many components are needed to represent a data sample.   Watch Video

Piecewise Linear Regression

The Piecewise Linear Regression procedure is designed to fit a regression model where the relationship between the dependent variable Y and the independent variable X is a continuous function consisting of 2 or more linear segments. The function is estimated using nonlinear least squares. The user specifies the number of segments and initial estimates of the locations where the segments join. The procedure then estimates the slopes, slope changes, and the locations at which the s changes occur. Watch Video

Stability Studies

Stability studies are commonly used by pharmaceutical companies to estimate the rate of drug degradation and to establish shelf life. Measurements are typically made on samples from multiple batches at different points in time. Of primary interest is estimating the time at which the lower prediction limit from the degradation model crosses the lower specification limit for the drug. Depending on the structure of the data, batches may be treated as either a fixed or random factor.  Watch Video

Quantile Regression

The Quantile Regression procedure fits linear models to describe the relationship between selected quantiles of a dependent variable Y and one or more independent variables. The independent variables may be either quantitative or categorical. Unlike standard multiple regression procedures in which the model is used to predict mean response, quantile regression models may be used to predict any percentile. Median regression is a special case where the quantile to be predicted is the 50th percentile.  Watch Video

Alias Optimal Experimental Designs

New Alias-Optimal designs generated by the DOE Wizard consider not only the precision in the estimated model coefficients but also potential bias in those estimates caused by active effects that are not in the assumed model. Criteria such as D-optimality do not take into account aliasing caused by omitted effects. Sometimes, alternative D-optimal designs may be subject to considerably different amounts of aliasing. At other times, a small reduction in the efficiency of the selected design may result in a large reduction in potential bias.  Watch Video

Optimal Augmentation of Existing Exp. Designs

A new feature added to the DOE Wizard is the ability to add runs to an existing experiment so as to maximize a selected optimality criterion. The user first selects the number of runs to be added and then completes the dialog box shown below.  Watch Video

Equivalence Tests – Comparing Variances

New procedures have been added for demonstrating the equivalence or noninferiority of population variances. One procedure compares the variance of a single sample to a target value, while the other compares the variances of samples taken from 2 different populations. In the second case, the samples are considered to be “equivalent” if the ratio of their respective standard deviations falls within some specified interval surrounding 1.   Watch Video

Gage Studies – GLM Method

The GLM Method estimates the repeatability and reproducibility of a measurement system based on a study in which m appraisers measure n items r times. It also estimates important quantities such as the total variation, the precision-to-tolerance ratio, the standard deviation of the measurement error, and the percent of study contribution from various error components. In addition to variation introduced by appraisers and parts, additional factors may also be included. The additional factors may be treated as having either fixed or random effects. Note: This procedure will handle unbalanced data.  Watch Video

Decision Forests

The Decision Forests procedure implements a machine-learning process to predict observations from data. It creates models of 2 forms:

1. Classification models that divide observations into groups based on their observed characteristics.
2. Regression models that predict the value of a dependent variable.

The models are constructed by creating a large number of decision trees and averaging the predictions made from those trees. Many trees are constructed using a procedure similar to that of Classification and Regression Trees, with randomized node optimization and “bagging”.  Watch Video

Zero-Inflated Count Regression

The Zero Inflated Count Regression procedure is designed to fit a regression model in which the dependent variable Y consists of counts. The fitted regression model relates Y to one or more predictor variables X, which may be either quantitative or categorical. It is similar to the procedures for Poisson Regression and Negative Binomial Regression except that it contains an additional component that represents the occurrence of more zeroes that would be expected in those models. Data containing excess zeroes is very common, including such diverse examples as the number of days a student is absent from school, the number of insurance claims within a population where not everyone has insurance, the number of defects in a manufactured item, and wild animal counts.  Watch Video

Venn and Euler Diagrams

The Venn and Euler Diagrams procedure creates diagrams that display the relative frequency of occurrence of discrete events. They consist of circular regions that represent the frequency of specific events, where the overlap of the circles indicates the simultaneous occurrence of more than one event.  Watch Video

Waterfall Plots

3 types of waterfall plots have been added to version 19: an ordered plot, a sequential plot, and a 3-dimensional plot. Ordered Waterfall Plots are used to illustrate how a variable of interest increases or decreases amongst a sample of individuals. Data values are sorted and plotted as a barchart, usually with respect to a baseline equal to 0. A reference line may be added to the plot to display a target value.  Watch Video

Sequential Waterfall Plots are used to illustrate the cumulative effect of positive and negative contributions to a total value. Bars are drawn representing each contribution as well as totals and subtotals. Applications include financial analysis, inventory analysis, performance analysis, hiring, and demographics.

Three Dimensional Waterfall Plots are used to display multiple columns of data versus a common variable. One frequently encountered example is a Cumulative Spectral Decay plot, in which spectra are plotted at multiple times to illustrate changes in amplitude as a function of both frequency and time. In general, the plots are used to show changes in a quantitative variable versus both time and some other factor.

Python Interface

Version 19 adds an interface to the Python programming language that is similar to the interface to R that was added in Version 18. Procedures have been added that make it easy to pass data between Statgraphics and Python. Python scripts may also be written and executed from within Statgraphics.  Watch Video

K-Means Clustering

The K-Means Clustering procedure implements a machine-learning process to create groups or clusters of multivariate quantitative variables. Clusters are created by grouping observations that are close together in the space of the input variables.The calculations are performed by the “Scikit-learn” module in Python.  Watch Video

New Probability Distributions

Several new probability distributions have been added to the list of distributions available for fitting data and generating random numbers:

1. The zero-inflated Poisson distribution.  Watch Video

2. The zero-inflated negative binomial distribution.

3. The Johnson family of SB, SL and SU distributions.  Watch Video

Conformance Analysis for Attribute Capability

Conformance analysis has been added to the procedures for determining capability based on attribute data. Conformance analysis is used to determine how well a process conforms to specifications stated in terms of the number of nonconforming items per package.  Watch Video

New Statistical Tests

Several new statistical tests have been added to existing statistical procedures:

1. Levene’s test for comparing the variances of multiple samples.

2. The Wald-Wolfowitz test, which tests the hypothesis that 2 independent samples come from the same population.

3. The Games-Howell Post-Hoc multiple comparisons test in the Oneway ANOVA procedure.

Statistical Process Control Charts

The number of recalculation points for the control limits has been changed from 4 to 9. 

Missing Data Plot

A plot has been added to the Data Viewer to show the location of missing data in a data set.

Barcharts

An optional line may now be added to simple and multiple barcharts.  Watch Video

General Linear Models

Stepwise variable selection has been added to the GLM procedure for both quantitative and categorical factors. In addition, entry of interactions and other high-order terms has been simplified.  Watch Video

Paired Sample Comparisons

2 new diagnostic plots have been added to the Paired Sample Comparison procedure. The first is a Diagonal Plot that plots the paired values with a diagonal line.

Other Changes

New options have been added throughout the program.

1. The ability to undo several consecutive operations in the data editor.
2. The ability to reverse the order of the rows in a datasheet.
3. The ability to save images contained in the StatGallery as image files.
4. The ability to save graphs with a transparent background.
5. The ability to change the point size when saving graphs.
6. New one-sided prediction limits for Calibration Models.
7. Optional lines separating clusters on a dendrogram.
8. The ability to optimize only selected responses in the DOE Wizard.
9. New residual probability plots in many procedures.
10. Optional input of data and code columns in radar and spider plots.
11. Direct data import from Minitab project files, SAS transport files, and SPSS portable files.

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Strumenti di Statgraphics

Tra gli strumenti che rendono Statgraphics il software preferito dai tecnici del controllo qualità (e non solo) troviamo:

StatAdvisor

Ogni volta che Statgraphics produce dei risultati di un’analisi, lo StatAdvisor crea, in italiano o nella lingua scelta, una descrizione esplicativa con l’interpretazione dei risultati. Queste note possono essere copiate e incollate direttamente in altri documenti (ad esempio in una relazione scritta in MS Word). Questa funzionalità rende Statgraphics il programma preferito sia da utenti non statistici che vengono supportati nella lettura del risultato, sia da utenti esperti che evitano la noiosa parte dello spiegare un’analisi per i colleghi.

StatFolios

È lo strumento indispensabile per le operazioni ripetitive. Grazie ad esso è possibile salvare le analisi che si effettuano più frequentemente e rielaborarle ogni volta che si vuole.

StatGallery

Aggrega grafici e testi creati con differenti procedure in un’unica pagina per produrre un impaginato leggibile e accattivante.

StatLink

Grazie allo StatLink è possibile collegare un documento StatFolios a una o più fonti di dati in modo da poter effettuare analisi costantemente aggiornate.
Grazie all’opzione di esaminare automaticamente le fonti dati a un intervallo di tempo predefinito è possibile produrre automaticamente output aggiornati scadenziati.
Infine combinato con lo strumento StatPublish permette di programmare Statgraphics affinché aggiorni automaticamente l’output su un server web.

StatPublish

Permette di diffondere i risultati di un’analisi all’interno dell’intera organizzazione. È possibile creare un output HTML che può essere visualizzato da un qualsiasi web browser; è possibile, inoltre, automatizzare l’intera analisi e il processo di pubblicazione, creando uno script che può essere lanciato ogni giorno alla stessa ora.

StatWizard

È stato creato per assistere l’utente nel selezionare l’analisi più adatta per i propri dati. È sufficiente specificare le colonne che contengono i dati da analizzare e StatWizard farà il resto: suggerire l’analisi appropriata per quel tipo di dati, offrire di trasformare una o più delle variabili, aiutare a selezionare un subset dei dati se richiesto, ripetere l’analisi per ogni livello di una variabile “BY”. Dalla versione XVI anche la procedura DOE è stata semplificata tramite uno specifico Wizard.

SnapStats

Quando viene eseguita un’analisi statistica di base, questo strumento fornisce un metodo veloce per produrre un output preformattato in una singola pagina. È sufficiente inserire i nomi delle colonne che contengono i dati, premere invio e il risultato è fatto.

StatReporter

Nell’analisi dati è importante condividere i risultati con coloro che sono coinvolti nel processo decisionale. StatReporter è creato per aiutare nella preparazione di report di qualità all’interno di Statgraphics Centurion.
È possibile copiare all’interno di StatReporter, con un semplice click del mouse, ogni tabella o grafico creato all’interno del programma. È possibile inoltre collegare direttamente l’output alla fonte dati in modo che il report venga aggiornato automaticamente ogni volta che i dati cambiano.

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Caratteristiche generali di Statgraphics Centurion

Analysis of Variance

An important technique for analyzing the effect of categorical factors on a response is to perform an Analysis of Variance. An ANOVA decomposes the variability in the response variable amongst the different factors. Depending upon the type of analysis, it may be important to determine: (a) which factors have a significant effect on the response, and/or (b) how much of the variability in the response variable is attributable to each factor.

Statgraphics Technologies products provide several procedures for performing an analysis of variance.
https://www.statgraphics.com/analysis-of-variance

Basic Statistical Methods

Statpoint Technologies products provide a wide range of procedures for accomplishing basic statistical tasks. This section describes some procedures in our basic statistics software for handling data sampled from one or more populations.
https://www.statgraphics.com/basic-statistical-methods

Categorical Data Analysis

Categorical data is data that classifies an observation as belonging to one or more categories. For example, an item might be judged as good or bad, or a response to a survey might includes categories such as agree, disagree, or no opinion. Statgraphics includes many procedures for dealing with such data, including modeling procedures contained in the sections on Analysis of Variance, Regression Analysis, and Statistical Process Control.
https://www.statgraphics.com/categorical-data-analysis

Data Mining & Machine Learning

Data Mining refers to a process by which patterns are extracted from data. Such patterns often provide insights into relationships that can be used to improve business decision making. Statistical data mining tools and techniques can be roughly grouped according to their use for clustering, classification, association, and prediction.
https://www.statgraphics.com/data-mining

Design of Experiments

STATGRAPHICS contains extensive capabilities for the creation and analysis of statistically designed experiments. Statgraphics functions as design of experiments software that creates designs of several types.
https://www.statgraphics.com/design-of-experiments

Exploratory Data Analysis

Exploratory Data Analysis refers to a set of techniques originally developed by John Tukey to display data in such a way that interesting features will become apparent. Unlike classical methods which usually begin with an assumed model for the data, EDA techniques are used to encourage the data to suggest models that might be appropriate.
Statpoint Technologies products provide many EDA techniques, scattered throughout the statistical procedures and some of the most important exploratory data analysis methods.
https://www.statgraphics.com/exploratory-data-analysis

Life Data Analysis & Reliability

Determining the reliability of manufactured items often requires performing a life test and analyzing observed times to failure. Such data is frequently censored, in that some items being tested may not have failed when the life data analysis test is ended. In addition, it may be necessary to accelerate failure times by changing the value of an influential variable such as temperature using failure analysis tools. For all of these reasons, special failure analysis tools are needed to deal with this type of data.

STATGRAPHICS provides several special procedures for using life data analysis software and dealing with failures times.
https://www.statgraphics.com/life-data-analysis-and-reliability

Measurement Systems Analysis (Gage Studies)

Measurement systems analysis (MSA) is an assessment of variation contributed by the measuring system. When implementing any statistical method that relies on data, it is important to be sure that the systems that collect that data are both accurate and precise. A set of procedures, often referred to as “Gage Studies”, are widely used to assess the quality of measurement systems. The following table shows the measurement systems analysis procedures in Statgraphics’ systems analysis software.
https://www.statgraphics.com/measurement-systems-analysis

Monte Carlo Simulation

Monte Carlo simulation is used to estimate the distribution of variables when it is impossible or impractical to determine that distribution theoretically. It is used in many areas, including engineering, finance, and DFSS (Design for Six Sigma). A typical Monte Carlo simulation includes: (1) One or more input variables X, some of which usually follow a probability distribution. (2) One or more output variables Y, whose distribution is desired. (3) A mathematical model coupling the X’s and the Y’s. Statgraphics also includes a wide array of random number generators for use in simulation models.
https://www.statgraphics.com/monte-carlo

Multivariate Methods

Multivariate statistical methods are used to analyze the joint behavior of more than one random variable. There are a wide range of mulitvariate techniques available, as may be seen from the different statistical method examples below. These techniques can be done using Statgraphics Centurion multivariate statistical analysis.
https://www.statgraphics.com/multivariate-methods

Nonparametric Methods

Non-parametric methods are used to analyze data when the distributional assumptions of more common procedures are not satisfied. For example, many statistical procedures assume that the underlying error distribution is Gaussian, hence the widespread use of means and standard deviations. When the error distribution is not known, non-parametric statistical tests may be safer to apply.
The non-parametric methods in Statgraphics are options within the same procedures that apply the classical tests. These non-parametric statistical methods are classified below according to their application.
https://www.statgraphics.com/nonparametric-methods

Probability Distributions

Statgraphics contains several procedures for manipulating statistical probability distributions. Each of more than 50 distributions may be plotted, fit to data, and used to calculate critical values or tail areas. Random samples may also be generated from each of the distributions with this stat software.
https://www.statgraphics.com/probability-distributions

Process Capability Analysis

Statgraphics contains several procedures for manipulating statistical probability distributions. Each of 45 distributions may be plotted, fit to data, and used to calculate critical values or tail areas. Random samples may also be generated from each of the distributions with this stat software.
https://www.statgraphics.com/process-capability-analysis

Regression Analysis

Regression analysis is used to model the relationship between a response variable and one or more predictor variables. STATGRAPHICS Centurion provides a large number of procedures for fitting different types of regression models.
https://www.statgraphics.com/regression-analysis

Sample Size Determination

Before collecting data, it is important to determine how many samples are needed to perform a reliable analysis. This requires finding an adequate sample size n so that the statistics to be estimated have a sufficiently small margin of error and that any statistical tests to be performed have the required power.

Statgraphics Technologies products provide several procedures for determining the required sample size in statistics procedures.
https://www.statgraphics.com/sample-size-determination

Six Sigma & Lean

Six Sigma analysis is a structured approach to business management that concentrates on improving quality by reducing process variability and eliminating major failure mechanisms. Since it relies heavily on the collection and analysis of data, statistical programs such as Statgraphics are a vital component of all serious Six Sigma implementations. Our Lean Six Sigma analytical tools add important concepts from lean manufacturing, which concentrates on the elimination of unnecessary resource utilization.
https://www.statgraphics.com/six-sigma-lean

Statistical Process Control Charts

One of the most important actions that can help maintain the quality of any good or service is to collect relevant data consistently over time, plot it, and examine the plots carefully. All statistical process control charts plot data (or a statistic calculated from data) versus time, with control limits designed to alert the analyst to events beyond normal sampling variability.

Our STATGRAPHICS Centurion SPC software packages provide one of the most extensive collection of control charts available. All control charts can be used for Phase I studies, in which the data determine the location of the control limits, and Phase II studies, in which the data are compared against a pre-established standard. A special procedure is also provided to help design a control chart with acceptable power. E-mail alerts can be generated using our SPC software packages for when points fall outside the control limits or when a run rule is violated.
https://www.statgraphics.com/statistical-process-control-charts

Time Series Analysis & Forecasting

Many types of data are collected over time. Stock prices, sales volumes, interest rates, and quality measurements are typical examples. Because of the sequential nature of the data, special statistical techniques that account for the dynamic nature of the data are required. Statgraphics’ products provides several procedures for dealing with time series data:
https://www.statgraphics.com/time-series-analysis-and-forecasting

Visualization

Graphical methods are often the best way to extract the information available in data. There are many techniques available to visualize that information, depending on the nature of the data. Statgraphics contains a large set of visualization tools, many with built-in animation to show how data change over time.
https://www.statgraphics.com/visualization

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Metodo SixSigma in Statgraphics

Because of the widespread use of Statgraphics in Six Sigma programs, users of the Professional Edition may choose instead to use a special Six Sigma menu. This menu organizes the procedures into the Six Sigma DMAIC categories, plus a couple of additional categories with advanced tools.

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Lingue disponibili per Statgraphics Centurion

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Statgraphics Licenza Studente

Statgraphics è disponibile anche nella speciale licenza dedicata agli studenti acquistabile solo esclusivamente direttamente dal produttore.

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Requisiti di sistema di Statgraphics

Windows XP, Vista, 7, 8, 10 or later

• 64-bit systems: 4 GB or more recommended
• 320 MB or greater of available disk storage
• Access to Internet

Editions

• 64-bit
• English, Italian, French, German, Spanish

NOTE: Installazione su Windows Vista

Per installare correttamente Statgraphics su un PC con Windows Vista è sufficiente:

1. Accedere al computer come Amministratore del sistema
2. Avviare il programma
3. Effettuare la registrazione utilizzando il codice di attivazione ricevuto

Dopo la registrazione, non sarà più necessario accedere come Amministratore, e sarà possibile accedere con il solito account utente standard.