Numerical information produced by controlled experiments. Researchers collecting experimental data are typically able to modify all factors related to the association being studied, including randomly assigning subjects to the treatment and control groups. Experimental data are not commonly used in the social sciences because they are costly to obtain and often raise moral and ethical concerns.
Kennedy, P. 1998. A Guide to Econometrics, Cambridge, MA: The MIT Press.
Wooldridge, J.M. 2003. Introductory Econometrics, Mason, OH: Thomas South-Western.
Rossi, P.H. et al. 1999. Evaluation: A Systematic Approach, Thousand Oaks, CA: Sage Publications, Inc..
Greene, L.. 2003. Econometric Analysis, 5th ed., Upper Saddle River, NJ: Prentice Hall.
|