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Statistics

General Statistical Resources

• Statpages.net: Web pages that perform statistical calculations statpages.org
  Great general reference with lots of interactive pages. Links to online statistical pages. Worth browsing the intro page to see all the available resources.
• Reading Statistics and Research www.readingstats.com/fourth
  Companion website for the book: Huck SW. Reading Statistics and Research 4th edition. Boston: Pearsons, 2004: The website has lots of quizzes and resources to work through.
• Open Epi: Open Source Epidemologic Statistics for Public Health www.openepi.com
  Tool bar makes this easy navigate. Has sample size calculator as well as many other resources.
• Rice University Virtual Lab in Statistics onlinestatbook.com/rvls.html
  Hyperstat: statistics "book" with links to other stat sites; simulations and demonstrations: lots of visuals to explain concepts; case studies with some medical examples; and analysis lab demonstrates how to work with data.
• Statistics to use www.physics.csbsju.edu/stats
  Covers common statistical tests and concepts. Good graphics to illustrate points.
• Simple Interactive Statistical Analysis home.clara.net/sisa/
  Allows you to conduct statistical analysis directly in the program. Good to give you a feel for how the different statistical tests work.
• CDC: Epi Info Home Page www.cdc.gov/epiinfo/index.htm
  Free downloadable software for handling data sets, conducting surveys. Has sample size calculator as well.

Sample Size and Power Calcuators

• See also StatPages.net and OpenEpi (above)
• JavaStat: retrospective power analysis statpages.org/postpowr.html
  Post-hoc power anaysis. Good to use as a reader of the literature if authors fail to address power. Good description of controversy.
• PS: Power and Sample Size calculations (Vanderbilt) biostat.mc.vanderbilt.edu/twiki/bin/view/Main/PowerSampleSize
  Software that can be downloaded to calculate sample size. Addresses several hard to find issues in sample size calcuations such as for paired data.
• Ohio State: Statistics Department www.stat.ohio-state.edu/~jch/ssinput.html
  Sample size calculator for multiple groups
• Creative Research Systems: sample size calculator www.surveysystem.com/sscalc.htm
  Sample size calculator for survey research.

Effect Size

• Cemcentre.org www.cemcentre.org/renderpage.asp?linkid=30325015
  This focuses on education research however is one of the clearest explanations of effect size and its application.

Resources for finding statistics on diseases and demographics

• CDC: Data and Statistics www.cdc.gov/scientific.htm
  Links to scientific data on statistics and scientific laboratory data.
• National Center for Health Statistics www.cdc.gov/nchs/
  Provides national health, morbidity and mortality statistics and offers free-access to specific data warehouses.

Meta-sites to other statistical resources

• The World Wide Web Virtual Library: Statistics www.stat.ufl.edu/vlib/statistics.html
  Lists hyperlinks to a variety of statistics software services, tutorials, schools of statistics, statistics news groups and journals. (Be sure to scroll past all the country links to resources toward the bottom.)