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st: RE: RE: RE: RE: RE: summarize conditions within subjects in panel data
From
"Hoffman, George" <[email protected]>
To
"[email protected]" <[email protected]>
Subject
st: RE: RE: RE: RE: RE: summarize conditions within subjects in panel data
Date
Mon, 29 Nov 2010 12:44:02 -0600
Not quite.
The problem is with missing values.
bysort id (hour) : gen mysum = sum(varx < 50)
the function sum(varx<50) reports 0 if varx is missing.
But - if varx is missing for the entirety of the hours in a given id, I'd like mysum = sum(varx<50) to be missing.
If I add if varx<. To the end of the bysort... command, then the sum is missing if the varx is missing in the last hour.
This is a generic issue that I've been thinking wrongly about for years, and need correction!
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Hoffman, George
Sent: Monday, November 29, 2010 12:26 PM
To: [email protected]
Subject: st: RE: RE: RE: RE: summarize conditions within subjects in panel data
This works. Thanks!
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Nick Cox
Sent: Monday, November 29, 2010 12:13 PM
To: '[email protected]'
Subject: st: RE: RE: RE: summarize conditions within subjects in panel data
bysort id (hour) : gen mysum = sum(varx < 50)
Nick
[email protected]
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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