Notes on Regression Discontinuity Methods - [athena.sas.upenn ...

Should analysis condition on other covariates?
• There may be other covariates (Z) thatareobservedandthat
determine outcomes
• Presence of these covariates rarely changes the identification
strategy. The distribution of outcomes is usually continuous in
other covariates.
• Do not necessarily need to condition on other covariates.
• In practice, conditioning on Z may be helpful if we use observations
on X that are not too close to c.