how to do propensity score matching with panel data when does ps match work for age group how to use propensity score matching when do you match propensity scores what age can you match propensity score age of propensity match analysis what are the characteristics of propensity match age of propensity matching when does propensity score match with panel when is psmatch matching set when to use propensity score to match with data age for propensity test match how to pair the propensity score in stata age difference in differences stata age matching in stata what is the propensity score what does propensity score match mean can propensity score be used to match a panel? how to do the propensity score match with panel data how is propensity score matching performed