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Re: st: Converting count to dichotomous variable
From
Eric Booth <[email protected]>
To
[email protected]
Subject
Re: st: Converting count to dichotomous variable
Date
Fri, 9 Mar 2012 15:57:26 -0600
<>
One strategy is to take the max number of mortalities (via -egen-) across all obs. in each day (or each pond/day -- I'm not sure which you need) and then recode anything greater than zero as a "1" indicating that mortalities occurred (leaving it as zero otherwise). Here a quick example:
***************!
clear
*--fake data
set obs 7
g var3 = _n
expand 365
sort var3
g var2 = int(30+runiform()*100)
g var1 = int(runiform()*4)
su var*
**var4**
*--daily mortality
by var3: g day = _n
*---1. for each pond/day
g var4_a = 1 if var1 != 0 //no mortalities each pond/day
replace var4_a = 0 if mi(var4_a)
*---2. for each day only
bys day: egen var4_b = max(var2)
recode var4_b (1/max = 1) (0=0)
su var4*
***************!
- Eric
__
Eric A. Booth
Public Policy Research Institute
Texas A&M University
[email protected]
Office: +979.845.6754
On Mar 9, 2012, at 3:30 PM, Aminu Shittu wrote:
> Dear Statalisters,
>
> I have var1 in my data set which represents number of death in a fish pond and var2 representing the existing number. The daily mortality was recorded in 7 fish ponds (var3) for a period of 1 year (365x7 rows). I am interested in creating a dichotomous var4, to indicate whether a daily mortality had occurred or not, without taking number of counts into consideration. Is it possible to do this in Stata or Excel?
>
> Aminu.
> *
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