What is SigmaStat ?
SigmaStat is an easy-to-use, wizard-based statistical software package designed to guide users through every step of the analysis and perform powerful statistical analysis without being a statistical expert. SigmaStat is adapted to the areas of life sciences and medical research, but can be a valuable product for scientists in many fields.
With SigmaStat, you can be sure that you have analyzed your data correctly.
And you also save time!
Because it takes you step by step through analysis, SigmaStat ensures that you:
- Use the appropriate statistical method to analyze your data
- Avoid the risk of statistical error
- Interpret the results correctly
- Generate an appropriate view and professional report
Analysis features
Regression Wizard
- Solve a nonlinear regression problem with one of our 150 integrated adjustment equations or with a user-defined adjustment equation
- The raw data for the regression can be selected from the worksheet using a variety of data formats or can be selected from a chart in a chart
- The program's standard tuning library contains models based on polynomials, rational functions, exponential growth and decay, sigmoidal functions, ligand binding, waveforms, logarithmic functions, probability distribution and density functions, linear by parts and others
- User-defined equations are created from the Regression Wizard using the Edit function dialog box and are saved in our default tuning library. They can optionally be saved to any notebook file. An equation item in an notebook will start the Regression Wizard by double-clicking
- The equations of the adjustment model are encoded with transform language and can contain definitions of constants, weight variables, linear equalityandrestrictions of inequality and other variables
- The initial parameter values required by the algorithm can be specified as constant or defined using our automatic parameter estimation functions in Transform Language
- Adjustment equations can contain up to 500 parameters and up to 50 independent variables
- Weighted regression is supported with weights defined as a constant per observation or as functions of regression parameters. Weight functions allow the user to apply robust procedures for estimating parameters that measure the effects of outliers. Examples are provided in the program tuning library and in the sample files installed
- Options are available to create various types of results shown in the regression report or worksheet.
- Graphs of the best fit equation with the raw data can be created for models with two or three independent variables. Trust tracks can be added
- Templates can be created to solve other types of problems besides the common data tuning. Examples are contained in the sample files and include global curve adjustment, equation systems resolution, quantile regression, and distribution adjustment
Histogram Assistant
- Produce a frequency histogram from a spreadsheet column
- Select from multiple chart output styles
Graph Equation Dialog
- Create the chart of a function in two or three dimensions
- Enter a user-defined function or select an equation item from an equation library
- Evaluate functions for specific values of the independent variable(s) or solve equations to obtain values for the independent variable for specified values of the dependent variable. Copy the results to paste into the spreadsheet, report, or chart page
Transformations
- Write your own numeric procedures, called Transforms, in the User-Defined Transform dialog box. Transform Language provides a vector-based computing environment with operations and functions that can manipulate spreadsheet data and perform many important calculations for data analysis
- Transformations can be saved as items in a notebook file or as separate files with the extension (.xfm). The installed program contains several files (.xfm). Examples of computational procedures in these transformations include cumulative distribution functions, bootstrapping, peak discovery, frequency tables, D'Agostino-Pearson normality test, and estimation of the variance of functions of a random variable
- Transform Language is used in the Plot Equation dialog box and regression wizard to define equation items in an notebook
Quick transformations
- You can use the Quick Transform dialog box to quickly create and calculate single-line transformations
- The dialog box supports column selection and a palette of functions to create transformations easily. The output columns of a quick transformation can be titled with the transformation itself for later reference
- Quick transformations are saved with the worksheet they use for output
- The output of a quick transformation can be automatically updated for changes to the input data
System requirements:
Hardware
Processor 486 or higher
16 MB of RAM required (32 MB or more recommended)
10 MB of hard disk space
Programmes
Windows 10, 8.x, 7, Windows Vista, 95, 98, NT e XP (32 bits)
