Error "initial values not feasible" for multiple imputation.

[Sandy Tak]

Dear experts,

I'd like to ask for your help with syntax.
I am doing a multiple imputation as below, but I get an error "initial values not feasible error occurred during imputation of choice on m = 1"
Would you let me know how to fix this?

Thank you
Sandy


mi set flong

mi register imputed choice

mi register regular term mexempt rexempt wexempt alast hlast ///
casphase cascaa sat_total sat_math sat_verb sat_write ///
cjmajor gender

mi set M=10

mi impute truncreg choice = term mexempt rexempt wexempt alast hlast ///
casphase sat_total cascaa sat_verb sat_math sat_write ///
gender cjmajor, replace ll(1) ul(3)

[Sandy Tak]

Hello,

While waiting to get some help here, I continued checking this and that, and narrowed the source of the problem.

The syntax below worked fine.

However, when I registered the 'race' variable as imputed and put it as DV in the impute syntax after (mlogit) choice,
it showed the error, "initial values not feasible".
But, if I remove ll(200) ul(800) from the syntax below, then it worked fine with the 'race' variable as imputed and as DV in the impute syntax.

Also, when I only registered choice and race as imputed and put the two variables as DV after (mlogit) in the impute syntax, it worked fine as well.

The race variable was coded 1=asian, 2=black, 3=hispanic, 4=white, 5=indian, and missing values.

Before finding this, I thought the problem was with somewhat lower or upper limits of the sat scores, but turns out that it's not true.

Can anybody help me with this?



mi set flong

. mi set M=5
(5 imputations added; M = 5)

. mi register imputed sat_math sat_verb sat_write sat_total choice
(7531 m=0 obs. now marked as incomplete)

.
. mi register regular race id term mexempt rexempt wexempt alast hlast ///
> casphase cascaa

.
. mi impute chained (truncreg, ll(200) ul(800)) sat_verb sat_math sat_write ///
> (truncreg, ll(400) ul(1600)) sat_total ///
> (mlogit) choice = race id term mexempt rexempt wexempt alast hlast ///
> casphase cascaa, replace force