> stem(m$tst[m$tst!=0]) The decimal point is 1 digit(s) to the right of the | 3 | 0 3 | 4 | 13344 4 | 5568 5 | 2222333444 5 | 5567888899 6 | 22222224444444 6 | 5667778888899999 7 | 00001111222223333444 7 | 55666677777778888888899999 8 | 000112222244444 8 | 55555566778899 9 | 00000000111111222222333444 9 | 55555556666667777788999999 10 | 0000000000000 > summary(m$tst[m$tst!=0]) Min. 1st Qu. Median Mean 3rd Qu. Max. 30.00 67.75 78.00 77.92 92.00 100.00