On Nov 10, 2011, at 8:41 AM, Sarah Goslee wrote:
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)
> sex & sex1
[1] TRUE FALSE FALSE FALSE
> 0+(sex & sex1)
[1] 1 0 0 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 . <loove...@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.
--
David Winsemius, MD
West Hartford, CT
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