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Re: st: plot predicted effects after regression
Yumin Sheng <email@example.com> asked a question where the
answer provided by several people was to use a constant
variable in the -by()- option of -adjust-.
Richard Williams <Richard.A.Williams.firstname.lastname@example.org> commented about
this trick as follows:
> As a sidelight, I've never liked or understood the requirement
> that -adjust- include the -by- parameter; why not just default
> to analyzing all cases at once instead of requiring that
> calculations be done for subgroups? It can be worked around,
> but it is a minor nuisance so why require it in the first
When -adjust- was first written, we did not forsee it being used
without -by()-. However, I now see that this can be useful. I
will enhance -adjust- so that -by()- is optional.
Look for this enhancement in one of the upcoming ado updates.
Also, thanks to Nick Cox <email@example.com>, for the
> Given interest in doing this, a minute detail
> may be worth noting.
> Fooling -adjust- by supplying a -by()- variable
> which is constant (and, strictly, non-missing
> for the observations of interest) is the trick
> here which perhaps many have worked out for
> It doesn't really matter what the value of the -by()-
> variable is, subject to those constraints. However,
> gen all = " "
> has the best cosmetic effect on the tabular
> output of -adjust-. To spell this out,
> -adjust- is happy that the -by()- argument
> is a string variable, but not happy that
> it is missing. Setting it to a space
> produces a clean table as below.
I will take advantage of this idea when I make the change to
Ken Higbee firstname.lastname@example.org
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