how to create duplicated ID in multi-records per subject dataset
if the records are in the file dupIDs.txt, then when you read them in,
the IDs become factors. Coercing them to numeric gets them to assign
a unique number to each factor.
So, you could try the following:
dupIDs <- read.table("dupIDs.txt", header = T)
dupIDs$ID2 <- cummax(as.numeric(dupIDs$ID)-1)
dupIDs
ID record ID2 1 1 20 1 2 . 30 1 3 . 25 1 4 2 26 2 5 . 15 2 6 3 21 3 HTH, Andrew.
On Dec 15, 12:56?pm, "Zhixin Liu" <z... at efs.mq.edu.au> wrote:
Hi R helpers, If I have a dataset looks like: ID ? record 1 ? ? ? ?20 . ? ? ? ? 30 . ? ? ? ? 25 2 ? ? ? ? 26 . ? ? ? ? 15 3 ? ? ? ? 21 4..................... And I want it becomes ID ? record 1 ? ? ? ?20 1 ? ? ? ?30 1 ? ? ? ?25 2 ? ? ? ? 26 2 ? ? ? ?15 3 ? ? ? ? 21 4..................... That is, I have to duplicate IDs for those with multiple records. I am wondering it is possible to be done in R, and I am grateful if you would like to show me the direction. Many thanks! Zhixin
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