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All, I have data that looks like below. For each id there may be more than one value per day. I want to select a random value for that day for that id. The end result would hopefully be a matrix with the id as rows, date as columns and populated by the random hab value. Thanks to someone on here (Jim) I know how to do the matrix, but now realize I need to randomly select some of my values.

Hello! I am trying with this question again: I would like to test few distributional assumptions for some behavioral response data. There are few theories about true distribution of those data, like: normal, lognormal, gamma, ex-Gaussian (exponential-Gaussian), Wald (inverse Gaussian) etc. The best way would be via qq-plot, to show to students differences. First two are trivial: qqnorm(dat$X)

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