On May 29, 2013, at 3:10 PM, Daniel Tucker wrote:
Let me explain what I am planning on doing; some background is
probably
necessary and in hindsight the first email doesn't accurately
describe what
I am looking to do. I'm trying to run a conditional logit model, but
I want
to have a different strata depending on the value of another variable
if sample==1 I want my strata to be stratida
if sample==2 I want my strata to be stratidb
if sample==3 I want my strata to be stratidc
stratida/stratidb/stratidc are NOT variables already in the dataset.
they represent a string combination of three already present numerical
variables (year, byregn2, group) and differ for when the variable
sample is
==1,2 or 3. They are different variables for labeling purposes. What
I am
looking to do is replicate these in one variable--make one variable
that is
the string combination of year, byregn2, and group and then use it
as my
strata.
If dfrm is a data.frame with column names: year, byregn2, group then
creating a 4th column named strata:
dfrm$strata <- with( dfrm, paste0(year, byregn2, group) )
If you want tested code, you need to offer actual R objects.
--
David.
On Wed, May 29, 2013 at 1:53 PM, Adams, Jean <jvad...@usgs.gov> wrote:
You are limiting yourself to getting help from only those people that
understand the STATA language. You may improve your chances for a
helpful
response if you tell us in English what the STATA commands mean.
Jean
On Wed, May 29, 2013 at 10:37 AM, Daniel Tucker <dtuck...@u.rochester.edu
>wrote:
R list members,
I am trying to replicate a command script in STATA and find
equivalency in R to the following Stata command:
egen stratida = concat(year byregn2 group) if sample==1
egen stratidb = concat(year byregn2 group) if sample==2
egen stratidc = concat(year byregn2 group) if sample==3
Not sure if I should just try to make a for loop and use the paste
operator or if there is somewhere else I should be looking.
Thanks,
Daniel
David Winsemius, MD
Alameda, CA, USA
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