I have a large dataset, a sample of which is: a<- c(“A”, “B”,“A”, “B”,“A”, “B”,“A”, “B”,“A”, “B”) b <-c(15, 35, 20, 99, 75, 64, 33, 78, 45, 20) c<- c( 111, 234, 456, 876, 246, 662, 345, 480, 512, 179) d<- c(1.1, 3.2, 14.2, 8.7, 12.5, 5.9, 8.3, 6.0, 2.9, 9.3)
df <- data.frame(a,b,c,d) I’m trying to construct a data frame that shows the means of c & b based on the condition of d and grouped by a. I want to create the data frame below, then use ggplot2 to create a line plot of b at various conditions of d. I can compute the grouped means (d>=2, d>=4, etc.) one at a time using dplyr but haven’t figured out how to put them all together or put them in one data frame. I’d rather not use a loop and am relatively new to R. Is there a way i can use tapply and set it to the conditions above so that I can create the df below? condition mean(b) mean(c) A d>=2 ____ _____ B d>=2 ____ _____ A d>=4 ____ _____ B d>=4 ____ _____ A d>=6 ____ _____ B d>=6 ____ _____ Ken kmna...@gmail.com 914-450-0816 (tel) 347-730-4813 (fax) ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.