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Power Calculation Software for Randomized Saturation Experiments

Berk Ozler's picture

One of the things I get asked when people are designing experiments – when they are either interested in or worried about spillover effects – is how to divvy up the clusters into treatment and control and what share of individuals within treatment clusters to assign within-cluster controls. The answer seems straightforward – it may look intuitive to assign a third to each group and I have seen a few designs that have done this, but it turns out that it’s a bit more complicated than that. There was no software that I am aware of that helped you with such power calculations, until now...

You ran a field experiment. Should you then run a regression?

Berk Ozler's picture
Recently, a colleague came over for dinner and made the following statement: “Person X told me that Imbens is now saying that we should not be running regressions to estimate average treatment effects in experiments.” When I showed some sympathy for this statement while focusing more on making tortillas, she was resistant: it was clear she did not want to give up on regression models…