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Re: st: command option in ado programming

From   Nick Winter <>
Subject   Re: st: command option in ado programming
Date   Tue, 18 Nov 2003 14:40:36 -0500

At 06:51 PM 11/17/2003 -0800, you wrote:
The problem was/is, I wish to have an option like -sigma2(z)-, and I
want users to specify exactly -sigma2(z)-, not -sigma(z)- or
something else; that is, the "2" is important. [This is because the
option parameterizes sigma^2 (the variance), which should be
carefully distinguished from sigma (the standard deviation).] I tried
something like

  syntax varlist, SIGMA2(string)

, but it seems that the "2" is not binding, so that if users
specify -sigma(z)-, Stata does not complain and treats it as if the
user specifies -sigma2(z)-, which is a result I want to avoid. That
is, I wish Stata would complain if the user inadvertently specifies
I think you can do it by creating two options, sigma() and sigma2(), and then catching any user use of sigma():

syntax , [ sigma(string) SIGMA2(string) ]

if `"`sigma'"'!="" {
display as error "option sigma() not allowed; use sigma2()"
exit 198


Of course, you could also rename the option "variance()"...

--Nick Winter

Nicholas Winter t 607.255.8819
Department of Government f 607.255.4530
308 White Hall
Cornell University
Ithaca, NY 14853-4601
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