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how to handle a longitudinal data
2 messages · gallon li, Chuck Cleland
gallon li wrote:
i have a data set with repeated measures on same people, structure like below: id x1 x2 ... 001 10 20 ... 001 8 45 ... 001 4 2 ... 002 .... 002 ... 002 .... 002 .... 003 .... ....... what is the easist way to show how many observations for each subject id?
If the data are in a data frame called df, do the following: table(df$id) Also, the following is useful for seeing how many people have a particular number of observations: table(table(df$id))
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