Do typical RCTs of Education Interventions Have sufficient Statistical Power for Linking Impacts on Teacher Practice and Student Achievement Outcomes?
Peter Z. Schochet
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 […]
Hedges and Hedberg (2007) paper:
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 […]
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 […]
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