StatMate is an ideal companion to Prism and InStat. StatMate complements these programs by
providing a collection of 8 statistical calculators to help you design statistically sound experiments
and to help you interpret results. StatMate comes with a short but comprehensive manual that
explains the uses of each calculator, and how to interpret the
results.
Plan an experiment
Three of StatMate's calculators help you properly design and set up your experiments, so that your
results are statistically sound.
 Test advisor
 StatMate helps you pick the right statistical test to use. Tell it the type of data
you are collecting, and the kind of comparison you want to make. StatMate suggests a test,
and tells you which GraphPad programs support that test.
 Calculate sample size
 How many subjects (data points) do you need? Naturally, the
answer is "it depends". It depends on how large a difference you are looking for, how much
your data vary, and on how willing you are to risk mistakenly finding a difference by chance
or mistakenly missing a real difference. StatMate helps you see the tradeoffs, so you can pick
an appropriate sample size for your experiment.
 Randomize
 To avoid subtle biases, it is best to randomly assign subjects to treatments.
StatMate will do this for you. Simply tell it how many treatment groups you need, and how
many subjects you want in each group. StatMate randomly assigns
each subject to a group.
Interpret statistical results
The remaining calculators provide you with tools to gain further insight into your own or published
results.
 Calculate P values
 Many publications (and some programs) just tell you that "P<0.05" or
"P>0.05", but don't tell you the exact value of P. StatMate will calculate P to four decimal
places, from t, z, F, r, or chisquare. It will also calculate a P value from the results of a runs
test, sign test, and McNemar's test.
 Calculate confidence intervals
 While many publications focus on P values, results are
often easier to interpret when expressed as a confidence interval. StatMate calculates a
confidence interval of a proportion, count, or mean. You specify whether you want 90%,
95% or 99% confidence.
 Calculate power
 Just because a study reaches a conclusion that the results "are not
statistically significant" doesn't mean that the treatment was ineffective. It is possible that the
study missed a small effect due to small sample size and/or large scatter. StatMate calculates
the power of a test to detect various hypothetical differences.
 Binomial or Poisson distributions
 Knowing the overall success rate (binomial) or average
number of events per time or objects per volume (Poisson) in a population, you might be
interested in predicting the likelihood of observing a particular outcome. StatMate calculates
the probabilities and reports the distribution of results.
 Bayesian calculations
 When reviewing the results of an experiment or laboratory test, you
need to interpret the statistical information in the context of what you knew before you did the
experiment (based on theory and previous data). StatMate performs the Bayesian
calculations required to do this.
Simple to use
StatMate is completely selfexplanatory. Choose a
calculator by clicking one of eight tabs at the top of the screen. Answer the questions at the top of
the screen, and click the Calculate button. StatMate reports your results in the bottom half of the
window. It's that simple.
System Requirements:
StatMate runs under Windows 3.1 or Windows 95 • It occupies less than 1 MB of space on your
hard drive
All product descriptions and artwork are copyright � 19952000 by GraphPad Software, Inc. All rights reserved.
GraphPad Prism, Prism and InStat are registered trademarks of GraphPad Software Inc.
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