-overlay- is a user-written command: the latest version visible to me is
on SSC.
(You are asked to state where user-written commands you use come from.)
As that version of -overlay- is written for Stata 7, it is incompatible
with graphics commands
such as -twoway lfitci- written for Stata 8 up.
Stata 8 up has its own overlay language, and that is what I recommend:
twoway lfitci y x if z == 1 || lfitci y x if z == 2
That said, I don't know why you get the error you do. There is a
user-written command -sto-
(also on SSC, and also very out-of-date), but I don't think it is
connected with -overlay-.
Installing -sto- would not fix the limitation of -overlay- for your
purposes.
Nick
[email protected]
Berthold Hoppe
I try to overlay two linear prediction plots using
overlay y x, by(z) function(twoway lfitci).
The linear regressions are made, but before graphing a black screen,
the error "unrecognized command: sto" r(199) is shown.
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