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st: RE: RE: RE: summarize conditions within subjects in panel data


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: RE: summarize conditions within subjects in panel data
Date   Mon, 29 Nov 2010 18:13:08 +0000

bysort id (hour) : gen mysum = sum(varx < 50) 

Nick 
n.j.cox@durham.ac.uk 

Hoffman, George

id: integers 1,2....200
hour: integers 1,2...48
varx : continuous, 0-100 and missing

Nick Cox

We need to know more about how -hour- is defined and measured. Is it a time since some zero, or a duration? Show a segment of your data for one subject. 

Hoffman, George

I've got a panel dataset (xt) uniquely identified by subject (id)  and time (hour), sorted by id hour.
I'd like to generate a variable that counts the cumulative (within id, across hour) number of hours that a variable is less than 50.
My code so far:

gen varxl50 = varx <50 if varx <.
bysort patnum (hour): gen varxl50sum = sum(varxl50)

I'm running into problems because of missing values I think.
Does this code look right?
Is there a mode succinct way to code this?


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