General Statistical Resources
- Statpages: Web pages that perform statistical calculations statpages.info
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
Companion website for the book: Huck SW. Reading Statistics and Research 6th edition. Boston: Pearsons, 2012: The website has lots of quizzes and resources to work through. The "Misconceptions" section is good to help solidify key concepts.
- 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 www.quantitativeskills.com/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.
- Wikipedia en.wikipedia.org/wiki/Statistics plus search any stats term you are looking up
Under usual circumstances we would not recommend Wikipedia as a resource because of the open source nature of the reference. However, we have found it may be a good place to start for descriptions for many statistical terms and it provides good links to other resources. This link is specific to the statistics section which gives a brief primer; the resources at the end are good too. Please be sure to check other references as well.
- Multiplicity and Statistical Adjustments for Type I Error www.nejm.org/doi/pdf/10.1056/NEJMra1709701
Article from New England Journal of Medicine.
Sample Size and Power Calcuators
- See also StatPages and OpenEpi (above)
- JavaStat: retrospective power analysis statpages.org/postpowr.html
Post-hoc power analysis. 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/wiki/Main/PowerSampleSize
Software that can be downloaded to calculate sample size. Addresses several hard to find issues in sample size calculations (eg, paired data).
- Creative Research Systems: sample size calculator www.surveysystem.com/sscalc.htm
Sample size calculator for survey research.
Resources for finding statistics on diseases and demographics
- CDC: Data and Statistics www.cdc.gov/DataStatistics
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.