Why are my dplyr group_by & summarize not working properly? (name-collision with plyr)
I have a data frame that looks like this: #df ID DRUG FED AUC0t Tmax Cmax 1 1 0 100 5 20 2 1 1 200 6 25 3 0 1 NA 2 30 4 0 0 150 6 65 Ans so on. I want to summarize some statistics on AUC, Tmax and Cmax by drug DRUG and FED STATUS FED . I use dplyr. For example: for the AUC: CI90lo <- function(x) quantile(x, probs=0.05, na.rm=TRUE) CI90hi <- function(x) quantile(x, probs=0.95, na.rm=TRUE) summary <- df %>% group_by(DRUG,FED) %>% summarize(mean=mean(AUC0t, na.rm=TRUE), low = CI90lo(AUC0t), high= CI90hi(AUC0t), min=min(AUC0t, na.rm=TRUE), max=max(AUC0t,na.rm=TRUE), sd= sd(AUC0t, na.rm=TRUE))