Splitt a data frame by median

I would like to divide my data based on the median into high risk and low risk data based on total_perTMB . I would like them to be in one column matched on the base tumour_sample_barcode

It seems you want to categorise each entry by where its above or below the median. If thats the case this should point you towards a possible approach

(yourdata <- data.frame(tumorcode=letters[1:6],

(solved <- mutate(yourdata,
       above_median = total_perMb> median(total_perMb)))

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