[John Willett]

Thanks, Rich, I'll go and check it out. Appreciate the input. John

[John Willett]

I had difficulty reading and understanding the mi impute intreg manual. In particular, in the options section for the routine (Stata v.18, on p. 172), it says that one must specify both ll( ) and ul( ), implying that you can't have an open-ended interval, which is required in tobit analysis? Perhaps I am not reading this correctly, am I misreading the manual? Thanks for the help.

[Clyde Schechter]

If you have an open ended interval, say Y can be in the range from 25 and up with no upper limit, you would set the lower limit to 25 and the upper limit to missing value (.). Similarly, if it could be anything from 25 downward with no lower limit, you set the upper limit to 25 and the lower limit to missing value (.). This is all explained in -help mi impute intreg- under the ll(varname) and ul(varname) options, though the language used is a bit convoluted..