Which statistical test to use?

To find out which test to use, make sure you know your data

• • independent variables (groups or conditions; what you manipulate)
  • dependent variables (what you measure)
  • paired/unpaired data (do the same people go through all the conditions or not?; check within vs. between-subjects design)
  • level of measurement (categorial, metrical)

Recommended Reading

• Discovering statistics using R
• Choosing The Correct Statistical Test In Sas, Stata, Spss And R
• Statistical Methods for HCI Research (wiki)