Re: [R] conditional mean between two data frames with different levels

Thank you so much Josh, that's exactly what i needed! Cheers alb -- View this message in context: http://r.789695.n4.nabble.com/conditional-mean-between-two-data-frames-with-different-levels-tp3049010p3049980.html Sent from the R help mailing list archive at Nabble.com.

Re: [R] conditional mean between two data frames with different levels

Hi Alberto, This should do it. 'x' is equivalent to your alfa vector. Cheers, Josh ## your example data, in a form R can read dat1 <- data.frame(score = c(1, 2, 0, 2, 1, 1, 3, 2, 1, 0), teams = c("a", "b", "c", "d", "e", "a", "b", "c", "d", "e")) dat2 <- data.frame(score = c(2, 3, 1, 0, 0,

Re: [R] conditional mean between two data frames with different levels

Thank you very much Josh, I guess you`re right. So this is an example: data frame 1 has 2 columns and 10 rows. The first column is "score" a variable indicating the number of goals scored by a football team score<-c(1,2,0,2,1,1,3,2,1,0), column 2 contains the football "teams " where teams<-c(a,b,c

Re: [R] conditional mean between two data frames with different levels

Hi Alberto, It would help if you could provide a small example. I might break the problem down into three parts: 1) create a vector that has the final subgroupings you want 2) find the conditional means by subgroup 3) replicate the means as needed. My first guess would be start with: "==" or

[R] conditional mean between two data frames with different levels

Hi guys, I have two data frames: one referred to 2008 and one to 2009. Their structure is identical except for the different data in them. I need to create a vector alfa of the same length of the dataframe 2009 and fill each element with the mean of 2008$var1 conditional to the subgroup indicated