Dear friends - I hope you will forgive me another simple question,
illustrated by
ID <- c(1,1,1,2,2,3,3,3)
PERIOD <- c(1,2,3,2,3,1,2,3)
X <- runif(8,0,10))
FF <- data.frame(ID=ID,PERIOD=PERIOD,X=X)
I need to the fourth value of X as NA, and ID and PERIOD is updated to
1,1,1,2,2,2,3,3,3 and 1,2,3,1,2,3,1,2,3 respectively.
How do I use the pattern in ID and PERIOD to find the lacking X and put NA?
Best wishes
Troels Ring,
Aalborg, Denmark
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