Power analysis software G*Power


RCT, power analysis, and mediation factor

Do typical RCTs of Education Interventions Have sufficient Statistical Power for Linking Impacts on Teacher Practice and Student Achievement Outcomes?

October 2009

Peter Z. Schochet


How to determine sample size for a binary variable

If you need to determine sample size for your survey when a variable of interest is a binary outcome, you can use power analysis and decide how many subjects you need to reach out for survey participation. You should also adjust the sample size by expected response missing rate. I wrote an Excel file […]

Variance Almanac of Academic Achievement

Variance Almanac


Hedges and Hedberg (2007) paper:


Optimal Design Software Manual


PowerUp! manual (pdf)



Statistical power analysis in education research


Arc center


Bonferroni correction for power analysis with more than two groups

I'm trying to find a textbook reference for the following procedure written explicitly in the context of power analysis. Please let me know if you know (k u e k a w a AT gmail com).

When there are more than two conditions in the experiment design, the alpha level, one of the parameters that […]

SAS Proc POWER examples

Comparison of two independent groups:

proc power; twosamplemeans test=diff groupmeans = 0 | .2 stddev = 1 npergroup = . power = .8; run;

Comparison of dependent data (paired)

proc power; pairedmeans test=diff meandiff = .2 corr = 0.5 stddev = 1 npairs = . power = .8; run;

Comparison of proportions

proc power; twosamplefreq […]