InStat Features List

Column statistics

• Mean, median, 95% CI, SD, SEM. Also tests whether the distribution conforms to a Gaussian distribution using the Kolmogorov-Smirnov test.

Group comparisons

• Paired and unpaired t tests; Mann-Whitney and Wilcoxon nonparametric tests.
• Ordinary and repeated measures ANOVA followed by Bonferroni, Tukey, Student-Neuman-Keuls or Dunnett post tests.
• Kruskal-Wallis or Friedman nonparametric tests followed by Dunn post test.

Contingency tables

• Chi-square test with or without Yates’ continuity correction.
• Chi-square test for linear trend.
• Fisher’s exact test.
• Calculate 95% confidence intervals for the relative risk, odds ratio or difference between two proportions.
• Calculate the sensitivity, specificity, positive predictive value, negative predictive value and likelihood ratio with 95% confidence intervals.

Linear regression and correlation

• Calculate slope and intercept with 95% confidence intervals.
• Force the regression line through a specified point.
• Interpolate from a standard curve.
• Calculate correlation coefficient (Spearman or Pearson) and its confidence interval.
• Test for departure from linearity with a runs test or the F test for linearity.

Multiple regression and correlation

• Calculate a correlation matrix.
• Multiple regression using selected X variables.
• For each X variable, compute its best-fit coefficient with standard error and 95% confidence interval, and a P value testing whether the variable contributes significantly to the model.
• Compute the Variable Inflation Factor (VIF) to test for multicollinearity.
• Test for departure from linearity with a runs test or the F test for linearity.

Program features

• Up to 10,000 rows and 52 columns of data.
• Mathematically transform selected data (i.e., log, reciprocal, logit, etc.).
• Transpose rows and columns.
• Copy results or data to the clipboard, or export as a text file.
• Print graphs on any printer or export as Windows Metafile (.WMF) or PICT (Mac) files.
• Annotate your data and analyses using a built-in notes editor.
• InStat files contain analysis choices as well as data so you can quickly rerun the same test with new data.
• Combine 2 columns (add, subtract, multiply, divide) to create a new column.
• Import comma or tab delimited files.
• Import indexed (stacked) data, entire tables or selected rows and columns, filter selected data.
• Export the data table as a text table, or as indexed (stacked) file.
• Exclude selected values. They appear on the data table, but are treated as missing values by the analyses.

What's new in InStat 3 ?

New analyses:

InStat 3 intorduces several new features not available in Version 2. Most important are:

• Normality testing
• Multiple regression
• Correlation matrix
• Sensitivity and specificity of a test

New features:

We focussed on making InStat even easier to use, and providing even more statistical review. The online help has been completely rewritten, offering more guidance to help pick a test, and more extensive interpretation of the results. InStat 3.0 now includes analysis checklists to help you make sure you have chosen an appropriate test. We also included:

• More data transforms
• Combine (i.e. add or subtract) columns to create new columns
• Paste transpose
• Exclude values from analyses while keeping them on the data table
• More choices for importing and exporting data
• Open up to ten files at one time