This different question I think falls under the heading of a spell
problem. Here a "spell" just means any run or sequence of identical
conditions.
As mentioned just now, a detailed discussion of technique is available
in
SJ-7-2 dm0029 . . . . . . . . . . . . . . Speaking Stata: Identifying
spells
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N.
J. Cox
Q2/07 SJ 7(2):249--265 (no
commands)
shows how to handle spells with complete control over
spell specification
Independently of that, the program -tsspell- from SSC is a canned tool
for tackling several such problems. The help file contains several
worked examples.
Nick
[email protected]
Ashim Kapoor
This dataset has brought a question to my mind.
I want to do : -
egen j=group(var) BUT I do not want the group to SORT var, I only want
consecutive groups to have the same value for j ( this is what is
needed in the original question )
for example I would want the FIRST paired occurance of diathermy[2] to
be ONE group and the 2nd paired occurance of diathermy[2] to be
another group.
How would I do that ?
Here is a long way to do it!
egen j1=group(var1)
gen j2=_n
gen j3=j2
replace j3=j3[_n-1] if j1==j1[_n-1]
And then I would have the same group number j3 for same consecutive
items in var1. but I guess someone would have a variant of -egen
group- which DOES NOT do sorting?
Any comments ?
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