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Optimal Design

Sample Size Estimates for Multilevel Randomized Trials

by Karen Grace-Martin 2 Comments

If you learned much about calculating power or sample sizes in your statistics classes, chances are, it was on something very, very simple, like a z-test.

But there are many design issues that affect power in a study that go way beyond a z-test.  Like:

  • repeated measures
  • clustering of individuals
  • blocking
  • including covariates in a model

Regular sample size software can accommodate some of these issues, but not all.  And there is just something wonderful about finding a tool that does just what you need it to.

Especially when it’s free.

Enter Optimal Design Plus Empirical Evidence software. [Read more…] about Sample Size Estimates for Multilevel Randomized Trials

Tagged With: multilevel model, Optimal Design, Power Analysis, Randomized Trials, Sample Size Calculations

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