what is the name of the difference in differences model does the difference if the dependent variable y does not show up in lognormal can we use lognormal tobit model do tobit models use did what data is used to estimate a tobit model difference in differentials in tobit does stata work for lognormal data does r support difference in differences can stata use lognormal data to estimate a nonlinear model if y in lognormal is a missing point would the tobit model in r still work difference in differences in tobit does lognormal censoring work in r difference in differences r what is the difference in differences in stata can tobit model be used with a difference in differences can tobit model be derived from lognormal what is the difference in differences specification can stata use lognormal data can i use lognormal data in tobit difference in differences stata