Dear list, I have this dataframe
V1 V2 F1 1 A 2 0 2 A 3 0 3 A 4 1 4 B 3 0 5 B 2 1 6 C 6 0 7 C 2 0 8 C 6 0 and would like to calculate a new column with mean-values, following this rule 1. If F1 = 0 calculate the mean from V2 for each factor in V1. 2. If F1 = 1, then F1_mean = 0 So, the new DF should look like this V1 V2 F1 F1_mean 1 A 2 0 2.5 2 A 3 0 2.5 3 A 4 1 0.0 4 B 3 0 3.0 5 B 2 1 0.0 6 C 6 0 7.0 7 C 2 0 7.0 8 C 6 0 7.0 Thank you for any help! Patrick Hausmann ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
