I've got to say that I don't think missings could possibly be an issue
here.
I am still puzzled at why you got what you reported.
Nick
[email protected]
Thomas Triebs
thanks!
it seems it was some missing values that caused a problem for normal but
not for kdensity.
Nick Cox wrote:
> In Stata 10, I tried this
>
> sysuse auto, clear
> histogram mpg, by(foreign) normal
>
> without problem.
>
> Nick
> [email protected]
>
> Thomas Triebs
>
> the following works fine:
> histogram /varname/, kdensity by(yr)
>
> however when I do the same with a normal distribution:
> histogram /varname/, normal by(yr)
>
> I get the following error:
> error in expression: normden(x,,)*1
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