Re: [R] how to randomly select the samples with different probabilities for different classes?

Hi Marna, If we assume a sample size of 1, something like this: dat[sample(which(dat$group!="C"),ceiling(14*0.4),TRUE),] dat[sample(which(dat$group=="C"),floor(14*0.6),TRUE),] Then just step through the two subsets to access your samples. One problem is that you will not get exactly 40 or 60 %,

Re: [R] how to randomly select the samples with different probabilities for different classes?

Hello, If 60% of the 14 samples come from group C, then 8.4 samples should come from a group with 6 elements. Do you want sampling with replacement? If so maybe the following will do. perc <- c(0.4, 0.6) tmp <- split(seq_len(nrow(dat)), dat$group == "C") idx <- sapply(seq_along(tmp),

[R] how to randomly select the samples with different probabilities for different classes?

Hi R user, I have samples with covariates for different classes, I wanted to choose the samples of different groups with different probabilities. For example, I have a 22 samples size with 3 classes, groupA has 8 samples groupB has 8 samples groupC has 6 samples I want to select a total 14