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ngreifer / WeightIt

WeightIt: an R package for propensity score weighting
https://ngreifer.github.io/WeightIt/
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Estimand default #42

Closed statzhero closed 1 year ago

statzhero commented 1 year ago

This is sort of a silly questions but why is the default for the weightit() estimand argument "ATE" and not "ATT"?

ngreifer commented 1 year ago

A few reasons. It's the default in twang. It's also the estimand people most frequently use IPW for. Since at the time MatchIt could only target the ATT, I wanted to demonstrate WeightIt as a method for estimating other estimands, and to get people to be thinking about estimands rather than just use the default if they wanted to compare matching and weighting. It was kind of an arbitrary choice, though.