A guess: If you have a variable -m1- then
di m1
will be interpreted as
di m1[1]
rather than
di scalar(m1)
The binding -scalar()- is needed in cases of ambiguity.
Nick
[email protected]
Edwin Leuven
> running one of my ado's i get the following table
>
> -----------------------------------------------------------------
> | Mean % reduct
> Variable Sample | Treated Controls % bias |bias|
> ------------------------+----------------------------------------
> Ltaal Unmatched | 0 -.547782 118.0
> Matched |-.7002011 -.6988459 -0.3 99.8
> -----------------------------------------------------------------
>
> the unmatched mean among the treated should not be zero however
>
> the piece of code that calculates it is simply
>
> qui sum `v' if `treated'==1
>
> which gives, when i remove the -qui-, the following
>
> Variable | Obs Mean Std. Dev.
> Min Max
> -------------+----------------------------------------------
> ----------
> Ltaal | 296 -.7002011 .4792868
> -2.157421 .846165
>
> then i do this
>
> scalar m1 = r(mean)
> scalar v1 = r(Var)
>
> and adding this as a check:
>
> di m1
>
> gives
>
> 0
>
> !!
>
> if i change the name of the scalar to m1x, everything works
> fine, ie the
> 0 becomes -.7002011
>
> i am baffled...
>
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