a user friendly Windows application to calculate the sample size
needed in a study, survey, or experiment. It
can be used to study a range of scenarios when the plan is to test,
give an estimate, or calculate a confidence interval for the parameter
a wide range of procedures with examples and explanations of the parameters in a help menu. There
is also a separate pdf document with the examples for printout.
The results are presented as tables or graphs and summarized in
text to be copied and pasted into slides or other documents.
in StudySize have been validated against the articles they are based
on as well as against other sample size software.
for most standard tests as well as for specific parameters in
common statistical distributions
hypothesis testing, point estimation, and confidence interval
parameter can be calculated (not only sample size and power)
power comparisons in multiple windows
presented as single values or in tables and graphs grouped by
two other parameters
summary and description of performed analysis
distribution-, and hazard function plots for common statistical
Carlo simulation option when large sample formulas may be inappropriate
and non-inferiority testing for most tests
sequential methods for the most common designs
comparisons using the most common approaches
wide range of non-parametric tests for different assumed statistical