I have a data set that looks like the following: ID Responce 1 57 1 63 1 49 2 31 2 45 2 67 2 91 3 56 3 43 4 23 4 51 4 61 4 76 4 68 5 34 5 35 5 45 I used sample(unique(ID)) to select a sample if ID's, say, (1,4,5). Now I want to pull out the rows with ID's 1, 4, and 5. I've tried forceing the matrix into a vector but it does not create and appropriate vector. I've also tried the if statment but it didn't work right either. Any suggestions?
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