SSIZE is a small windows-program used to calculate sample sizes
for various popular (but simple) statistical designs. The programs uses a normal
distribution approximation to calculate sample sizes.
The current version of SSIZE (0.1f) can handle the following designs:
SSIZE is free and is guaranteed to do nothing.
Download the windows binaries for SSIZE v0.1f.
The rutines used in SSIZE are based on some functions
I made for S-plus a few years ago. This code has actually become the
basis for the sample-size functions in the new version of R.
If someone shows interest, I'll gladly include sample size calculations when looking at proportions as well as using the exact non-central t-distribution for calculating sample sizes.
If you're interested in testing, trying and giving suggestions to the programs, then let me know.
Here's a small java applet (to the right) that can estimate the LD between two biallelic markers. All genotyped individuals are assumed independent and that there is no information about their phase.
Note that the applet is not completed finished yet! The printed result is R^2 (also known as Delta^2) with values close to one being an indication of complete linkage disequilibrium. A result of "NaN" indicates that insufficient data is available to estimate LD (i.e., too many cells are zero) while a red result is caused by illegal cell values (e.g., by entering letters).
Go to the PEDIPET homepage.
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