Leonard, try putting a line break after the opening brace and another before
the closing brace (so you use 3 lines in all)
-----Original Message-----
From: Leonard Egede [mailto:[email protected]]
Sent: Wednesday, July 21, 2004 8:33 AM
To: [email protected]
Subject: st: RE: CREATING MUTUALLY EXCLUSIVE MULTILEVEL CATEGORICAL VARIABLE
Nick,
ran the code and i get the message below
gen ndiseases = hyt + hrt + jtn + srk + pulm + ren
.. gen status = 0 if ndiseases == 0
(11532 missing values generated)
.. tokenize "hyt hrt jtn srk pulm ren"
.. forval i = 1/6 { replace status = `i' if ``i'' == 1 & ndiseases == 1 }
==1 invalid name
r(198);
end of do-file
r(198);
leonard
>>> [email protected] 07/19/04 05:13AM >>>
I am not clear on your data structure.
One natural data structure would be seem to be to hold information on A
through F as indicator variables, 1 for has and 0 for has not condition.
gen ndiseases = A + B + C + D + E + F
counts diseases. Then
gen status = 0 if ndiseases = 0
tokenize "A B C D E F"
forval i = 1/6 {
replace status = `i' if ``i'' == 1 & ndiseases == 1 }
replace status = 7 if ndiseases > 2 & ndiseases < .
assert status < 8
Nick
[email protected]
Leonard E. Egede MD, MS
> I am trying to create a categorical variable with 8 levels each
> representing the presence of one of six discrete disease conditions.
> However, it is possible for subjects to have more than 1 disease
> condition. How do I create such a multi-level variable so that each
> level contains only subjects with 1 of the disease conditions and
> those with multiple disease conditions fall into a level and those
> with none of the diseases of interest fall into another level?
>
> I tried the generate and replace commands as shown below but i am
> uncertain of how stata handles arguments in the replace command
>
> ***What i have done so far***
> I created a multi-level variable using generate and replace capture
> discrete medical conditions with 7 categories as follows generate
> disease replace disease=2 if medical condition ==A replace disease=3
> if medical condition ==B replace disease=4 if medical condition ==C
> replace disease=5 if medical condition ==D replace disease=6 if
> medical condition ==E replace disease=7 if medical condition ==F
>
> The questions are - is this the right method? if so how do i code
> subjects with more than 1 of the conditions above i.e any combinations
> of A thru F. Also, how does this approach handle people with 2 or more
> of the specified conditions.
>
> I intend to use the 8 level variable in a logistic model with level 1
> (those without diseases of interest) as the reference.
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
