REKA SUNDARAM-STUKEL
> I typed the following:
>
> bysort id type: gen lag_choice=choice[_n-1]
>
> Could you please explain why 'year' needs to be in
> parenthesis. Thank you.
No; this is very well documented.
Various possible sources of explanation.
1. On-line help for -by-.
2. [U] 14.5 (pp.108-9 in Stata 8 version; p.84 in Stata 7 version).
3. There is a discussion of by: in Stata Journal 2(1), 86-102 (2002),
which may be accessible to you.
Nick
[email protected]
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