Fabulicious!!!!!!!!!!!!!!!!! It worked!!! One more question, in the following data frame as posted above:
SubID CSE1 CSE2 CSE3 CSE4 WSE1 WSE2 WSE3 WSE4 1 6 5 6 2 6 2 2 4 2 6 4 7 2 6 6 2 3 3 5 5 5 5 5 5 4 5 4 5 4 3 4 4 4 5 2 5 5 6 7 5 6 4 4 1 6 5 4 3 6 4 3 7 3 7 3 6 6 3 6 5 2 1 8 3 6 6 3 6 5 4 7 I want to draw the first random sample consisting of a row of integers under the first group of variables (CSE1, CSE2, CSE3, CSE4). For example, assuming the first draw yielded a sample of the first row (6, 5, 6, 2), now I want to draw another random sample consisting of two rows of integers under the second group of variables (WSE1, WSE2, WSE3, WSE4). Also, for the second draw, I want to restrict a vector I am going to sample from to only those rows that are not correspond to SubID I have sampled. That is, I want to sample two rows of integers under the second group of variables (WSE1, WSE2, WSE3, WSE4) from rows 2, 3, 4, 5, 6, 7, and 8. Also, I want to repeat this whole process (drawing 1 random row of integers under the first group of variables first, AND then another two random rows under the second group of variables) for 1000 times. Any ideas? would that be possible to do it by just revising the syntax you wrote above? many thanks!!! -- View this message in context: http://r.789695.n4.nabble.com/Sampling-problem-tp3043804p3045352.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.