> Dear Sir or Madam,

>

> I tried to use ml maximize command in Stata.

> But I received the following error message.

>

> Following the manual, I used the following program.

>

> program mynormal1_lf

> version 16

> args lnfj mu sigma

> quietly replace 'infj' = ln(normalden($ML_y1, 'mu', 'sigma') end

>

> sysuse auto

>

> . ml model lf mynormal1_lf (mpg = weight displacement) ()

>

> ml maximize

>

> invalid name

> r(198);

>

>

> Other mle-type programs such as mlexp work fine.

> Do I need to install programs to activate ml program in my Stata?

>

> Shigeru Matsumoto