hi Paulie,

Further to Sarah’s email, this will give the same sex indicator (both 0 or both 1 then samesex scores 1):

samesex<-ifelse(sex==sex1,1,0)

from what you have described this will give you the desired result

hope that helps,
Rob

Robert M Griffin
Department of Evolutionary Biology
Evolutionary Biology Centre
Uppsala University
Norbyvägen 18D
SE-752 36 Uppsala
Sweden

http://www.ebc.uu.se/Research/IEG/evbiol/people/pages/Griffin_Rob/


-----Original Message----- 
From: Sarah Goslee 
Sent: Thursday, November 10, 2011 2:41 PM 
To: David . 
Cc: r-help@r-project.org 
Subject: Re: [R] Creating dummys in R 

Without having any actual idea what you mean (sample data!), this might work:

sex <- c(1,0,1,0)
sex1 <- c(1,1,0,0)
samesex <- ifelse(sex == 1 & sex1 == 1, 1, 0)

Note that this does NOT return 1 if both initial variables are 0, so
it isn't really a samesex indicator, but it is my best guess as to
what you might want.

Sarah

On Thu, Nov 10, 2011 at 5:13 AM, David . <loovet88@hotmail.com> wrote:
>
> Dear R-project!
>
> How do i create 1 dummy from 2 already existing dummys. To be more precise, I want to create a dummy from a dummy called "sex" and another called "sex1" when both thoose dummys are 1 I want my created dummy "samesex" to take 1.
>
> Thanks for the help!
>
> Paulie
>
-- 
Sarah Goslee
http://www.functionaldiversity.org

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