Hi!!!   I am using this data set   record_id frequency1 success2 reliable3 discussion4 contribution5 A 3 2 3 3 9 B 4 2 2 2 14 C 3 3 3 3 9 D 4 2 3 3 7 E 5 4 4 4 14 F 5 4 4 4 2 G 3 3 4 3 14 H 5 3 4 3 14 I 3 4 4 4 5 J 5 4 4 4 14 K 4 2 2 2 14 L 4 2 2 2 14 M 3 4 4 4 1 N 3 4 4 4 11 O 3 4 4 4 9 P 5 4 4 4 2 Q 4 4 4 4 9 R 6 4 4 4 3 S 3 3 3 3 5 T 2 4 3 3 9 I wan to have these results   But I obtain the following message in the log: Tried really hard to come up with a solution, no success. Thank you for your help, very much appreciated!   Ana ... View more