how to create a new column with conditions

Now that you have been shown how to do this, post your (non-working) code next time. And configure your email program to send plain text so we will see what you saw.

a$PHENO <- ifelse( a$CURRELIG==1
                 & a$RTNPTHY==1
                 , 1
                 ,  ifelse( a$PLASER==2
                          , 2
                          , -9 ) )

or

a$PHENO <- with( a
               , ifelse( CURRELIG==1
                       & RTNPTHY==1
                       , 1
                       , ifelse( PLASER==2
                               , 2
                               , -9 ) ) )

Hi,

I have a data frame like this:

head(a)

           FID LASER2 CURRELIG PLASER RTNPTHY
1 fam1000_G1000      1        1      1       1
2 fam1001_G1001      1        1      1       1
3 fam1003_G1003      2        1      2       2
4 fam1005_G1005      1        1      1       2
5 fam1009_G1009      1        1      1       2
6 fam1052_G1052      1        1      1       2
...

I would like to create a new column called PHENO which would satisfy
these
conditions:

if CURRELIG=1 and RTNPTHY=1 than PHENO=1
if PLASER=2 than PHENO=2
otherwise is -9

Thanks
Ana

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