Power Analysis For Ttests
The main function, TPOWER, will compute the power of a ttest given an effect size (d), sample size (N), and alpha. By giving N as an array the program can be used to plan sample size for an experiment.
By setting the "PLOT" parameter to 1 the function calls plotpowfun, which plots the array N against power. By providing a desired power level, DESPWR, the program will also determine the minimum sample size needed to reach the desired power. Requirements:
· MATLAB Release: R14
· Statistics Toolbox
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