Questions tagged as 'plyr'

Suppose I have the following database vendas<-c(100,140,200,300,20,1000,200,3000) vendedor<-c("A","B","A","B","C","C","D","A") regiao<-c("Norte","Sul","Leste","Norte","Sul","Norte","Leste","Sul") df<-data.frame(vendedor,regiao,vend...

I need to separate the data into groups and perform the calculations in two or three groups / dimensions. I found the tapply function, it solves the problem. With it I get what I need using the average function, sum, etc. But now, I realiz...

Good morning, I need to generate the average, standard deviation, and coefficient of variation of the data frame below, from columns mat13 to mat16, as follows: library(plyr) co_entidade<-c(23, 40, 58, 82, 104, 171, 198, 201, 202,244)...