Mediation and Moderation

Readings

• • Kenny handout on testing mediation. [html]

• Spiller, S. A., Fitzsimons, G. J., Lynch Jr, J. G., & McClelland, G. H. (2013). Spotlights, floodlights, and the magic number zero: Simple effects tests in moderated regression. Journal of Marketing Research, 50(2), 277-288. [pdf]

Slides

• moderation.pdf

Software

• DeRosia

Data

• Lexington1015.dta

Stata code for mediation

• • use "Lexington Data 1015.dta"

    • gen iadvice = AInDegree

    • gen knowjob = knowledgejob

    • gen perf = overallperformance

    • regress perf iadvice

    • regress perf iadvice knowjob

    • findit sgmediation // then download

    • sgmediation perf, iv(iadvice) mv(knowjob)

    • bootstrap r(ind_eff), reps(5000): sgmediation perf, iv(iadvice) mv(knowjob)

    • estat bootstrap, percentile