I asked how to make the following three permissible:
>> (1) mymodel y x1 x2, translog
>> (2) mymodel y x1 x2, translog()
>> (3) mymodel y x1 x2, translog(homogeneous)
Blasnik and Winter kindly replied with the same solution:
> syntax [, TRanslog1 TRanslog2(string)]
Thanks to both of them! This surely solves my problem at hand, but it
also reminds me of an old problem I have encountered and not solved.
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
-sigma(z)-.
Any suggestion? Thanks.
Eddy
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