Biostatistics/Statistics

Introduction to biostatistics:
http://en.wikipedia.org/wiki/Biostatistics

Reading Statistics and research by Sky Hack:
http://www.readingstats.com/fourth/

UCLA department of statistics, Statistical calculators:
http://www.stat.ucla.edu/

Sample size calculator by the survey system:
http://www.surveysystem.com/sscalc.htm

Retrospective power calculations:
http://statpages.org/postpowr.html
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Sample size computation for multiple comparisons:
http://www.stat.osu.edu/~jch/ssinput.html

Statistics to Use:
http://www.physics.csbsju.edu/stats/

Simple interactive statistical analysis:
http://home.clara.net/sisa/

Rice virtual lab in statistics:
http://onlinestatbook.com/rvls.html
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Statistics:
http://www.statistics.com/

Virtual Library for statistics:
http://www.stat.ufl.edu/vlib/statistics.html

Little handbook of statistical practice:
http://www.tufts.edu/~gdallal/LHSP.HTM

Medpage guide to Biostatistics:
http://www.medpagetoday.com/Medpage-Guide-to-Biostatistics.pdf