# read in
df <- read.tsv("path/to/your/file")
# select only colnames beginning with rsid_set
df <- df[grep("^rsid_set",colnames(df)),]
Your follow-up, I don't understand. You'll have to clarify what you want.
# Take the means of each column:
means <- colMeans(df)
# normal distribution with 10k values
norms <- rnorm(10e3)
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