[R] "conditional duplicates"?

Christian Schulz ozric at web.de
Wed Nov 10 13:52:29 CET 2004


i would like check a repeated measurement dataset, whether
cases (which (id) could be more than one time included and not all same 
times included.)
have more than one times the same SMONTH!?

#This pseudo code didn't work with a for loop, because the [i+1] isn't 
How i could refer to [i+1] ?

if(ID[i] == ID[i+1] & SMONTH[i] !=[i+1])  {res[i] <- 0 }
if(ID[i] == ID[i+1] & SMONTH[i] == [i+1]) {res[i] <- 1 }
many thanks,

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