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Introduction 3
Two-Tailed Probabilities
All probabilities computed by this Toolkit are two-tailed. If you want the one-tailed
probability, divide by two.
Using This Toolkit
This Toolkit is designed for general statistics use, with particular attention to graphics
and to nonparametric statistical measures. Since it’s a large package, we give a
“roadmap” below that describes which routines can be useful for given types of work.
Descriptive Statistics
Stats and GroupedStats for general statistics such as mean, standard deviation, etc.
DataToFreq, TableToFreq, PlotHist, PlotCum, etc., for histograms and frequency polygons.
PlotScat for scatter plots.
Exploratory Data Analysis
LetterValues and BoxPlot. PlotResid and PlotObsResid for graphing residuals. The
section on “Data Transforms.” ScatPlot with SetLineType(“median”) for resistant linefitting
and SetGraphType(“logy”) for semi-log scales. Friedman for nonparametric twoway
ANOVA. The entire “Nonparametric Tests” section.
Regressions and ANOVA
The “Line-Fits, Regressions, and ANOVA” section. PlotScat, PlotObs, and their residuals
versions. Friedman and KruskalWallisH for nonparametric tests.
Simulations
The “Simulated Distributions” and “Sampling” sections. The “Data Transforms” section
may also be useful.
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