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2011 Aug 12
2
recode Variable in dependence of values of two other variables
Hi, as an R-beginner, I have a recoding problem and hope you can help me: I am working on a SPSS dataset, which I loaded into R (load("C:/...) I have 2 existing Variables: "ID" and "X" , and one variable to be computed: meanX.dependID (=mean of X for all rows in which ID has the same value) ID = subject ID. Since it is a longitudinal dataset, there are repeated measurement points for each subject, each of which appears in a new row. So, each ID value appears in many rows. (e.g. ID ==1 in row 1:5; ID ==2 in rows 6:8 etc)....