Experiments

* = excellent source of data
$ = may be expensive in time or money to do well
(adapted from Calhoun, 1994)

Resources

Materials from a workshop on quasi-experimental design
http://www.ipr.northwestern.edu/workshops/past-workshops/quasi-experimental-design-and-analysis-in-education/2012/

Good overview of quasi-experimental design
http://en.wikipedia.org/wiki/Quasi-experiment

A more detailed explanation
http://www.csulb.edu/~msaintg/ppa696/696quasi.htm

Mettetal, Mack @ FACET, 2014

Defining operationalization of variables