Dear list, I want to calculate the standard deviation using 'ave' on two different DFs.
In the first DF M1 has only 1 level: > str(x) 'data.frame': 18 obs. of 3 variables: $ M1: Factor w/ 1 level "A03": 1 1 1 1 ... $ M2: num 2.76 2.93 3.06 3.07 3.12 ... $ M3: Factor w/ 2 levels "Ausgewählt","Nicht ausgewählt": 1 1 1 1 ... and I am getting a correct 'NA' for the last value ave(x$M2, x$M1, factor(x$M3), FUN = sd) # [1] 0.1810123 0.1810123 0.1810123 0.1810123 # 0.1810123 0.1810123 0.1810123 0.1810123 0.1810123 # 0.1810123 0.1810123 0.1810123 0.1810123 # 0.1810123 0.1810123 0.1810123 0.1810123 NA This ist the second DF (here M1 as 138 Levels): > str(k) 'data.frame': 18 obs. of 3 variables: $ M1: Factor w/ 138 levels "A01","A02","A03",..: 3 3 3 3 ... $ M2: num 2.76 2.93 3.06 3.07 3.12 3.12 3.15 3.17 3.17 3.17 ... $ M3: Factor w/ 2 levels "Ausgewählt","Nicht ausgewählt": 1 1 1 1 ... and I am getting this error ave(k$M2, k$M1, factor(k$M3), FUN = sd) #Fehler in var(x, na.rm = na.rm) : 'x' ist leer So, what have I missed? Thank you for any help! Patrick ______________________________________________ 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.
