It is written in FORTRAN-77 and is in the public domain. It writes a log file of all calculated estimates and can produce an output file for plotting power curves. The program can generate help messages on request that facilitate the use of this software. The program can determine the sample size needed to detect a specified alternative hypothesis with the required power, the power with which a specific alternative hypothesis can be detected with a given sample size, or the specific alternative hypotheses that can be detected with a given power and sample size. Studies with dichotomous or continuous outcomes may involve either a matched or independent study design. The alternative hypotheses of interest may be specified either in terms of differing response rates, means, or survival times, or in terms of relative risks or odds ratios. A computer program is available that can be used for studies with dichotomous, continuous, or survival response measures. True power consumption PowerSuppl圜 offers you the most accurate PC power consumption calculator on the web for free.

The sample size and power equations for these designs are shown to be special cases of two generic formulae for sample size and power calculations.

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Pc power calc