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  Dear R-help,   I have a longitudinal dataset with about 5,000 subjects. To avoid overly cluttered plot of the individual profile, I want the plot to be shadowed and to randomly select say 100 subjects which will be depicted using darker lines on the plot.   Kindly guide me through on how to do this in R.   regards John  [[alternative HTML version deleted]]

Hello R-users     Kindly assist me with the following plot problem in R- My data looks like this (shortened because I have about 5000 observations).   dat <- read.table(textConnection("Id  Time Y      1 0   194 1 5.22 179 1 5.97 190 2 1.61 265 2 2.1  234 2 16.4 300 2 29.5 345 3 0    212 3 0.36 213 4 0    199 4 1.23  203 5  0   212 5  13.5 216 6  0    222 6  1.6 234" ), header =