The following sample size calculators are for free:
1. PS (http://biostat.mc.vanderbilt.edu/twiki/bin/view/Main/PowerSampleSize)
2. Russ Lenth's on-line sample size calculators
(http://www.stat.uiowa.edu/~rlenth/Power/)
3. Open-EPI
(http://www.openepi.com/Menu/OpenEpiMenu.htm)
4. David Schoenfeld's Statistical COnsiderations for Clinical Trials and Experiments
http://hedwig.mgh.harvard.edu/sample_size/size.html
5. SISA (Simple Interactive Statistical Analysis)
http://www.quantitativeskills.com/sisa/calculations/samsize.htm
Saturday, May 24, 2008
Biostatisticians as bloggers
Today, i came across a biostatistician blogger... it is amusing how he writes about his craft... i actually wish that i am like him, very able and seem happy, and contented with his chosen profession. I am supposed to be like that, need to be like that. Browsing his blog entries make me insecure actually, with my work... because all i have been doing are all applications in observational studies, i'm a little bit rusty with regards to applications in clinical trials... anyways, i hope someday i would be able to post just like this biostatistician blogger :)
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