Dear Srikanth,
There are many software packages (and information) available for sample size
calculations. Here you have some references:
1) Statistica POWER Analysis (StatSoft: www.statsoft.com)
2) Statmate (only for comparison of means and comparison of proportions, from
GraphPad: www.graphpad.com)
3) nQuery Advisor (Statistical Solutions: www.statsolusa.com)
4) StatXact (www.cytel.com)
My personal order of preference is:
nQuery, software for sample size calculations, has many different options and is
especially interesting if you want exact calculations.
Statistica has a Power analysis module which is nice because of the graphing
possibilities.
StatXact is limited but the sample size calculations tools are now added to the
package automatically (don't buy it if you only want to do sample size
calculations)
Statmate is a small tool that comes with the Prism software.
Hope this helps.
Hans Pottel
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