The first column has 331 rows, the number of factors in the second column is 20 repeated in order to have 331 rows too. What I need is to reapeat in the third column each of the 20 results derived from tapply(firstcolumn,secondcolumn,mean) as many times as each factor appears in the second column. So I'll have 331 values in the third column as well. I hope it's clear enough what I need to do.
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