A note on overadjustment in inverse probability weighted estimation
A note on overadjustment in inverse probability weighted estimation
Standardized means, commonly used in observational studies in epidemiology to adjust for potential confounders, are equal to inverse probability weighted means with inverse weights equal to the empirical propensity scores.More refined standardization corresponds with empirical propensity scores computed under more flexible models.Unnecessary standardization induces efficiency loss.However, according to the theory …