Power Analysis


How this is done

When drawing conclusions from the results of a statistical analysis we can commit one of two errors:

Power analysis provides a quantitative method to estimate the probability of obtaining a significant results in a given situation (i.e., rejecting the null hypothesis when the alternative hypothesis is actually true). Power analysis thus allows you to judge how likely it is that you will detect a treatment effect that really exists. In summary, power measures the probability of replicating your statistical decision given a repeated use of the same experimental design and sampling procedure. Power is affected by:


last modified: 3/26/14