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Conditional Correlation
2 messages · Mateus Rabello, Daniel Malter
This question was just answered yesterday in this post: http://r.789695.n4.nabble.com/Correlations-by-subgroups-td3599548.html#a3600553 One solution: x<-c(1,1,1,1,1,2,2,2,2,2) y<-rnorm(10) z<-y+rnorm(10) by(data.frame(y,z),factor(x),cor) HTH, Daniel
Mateus Rabello wrote:
Hi, How can I accomplish this in R. Example: I have the following data.frame: data <- data.frame(x=c(1,2,3,4,5,6,5,3,7,1,0,4,8),y=c(1,2,1,2,2,2,1,1,1,2,2,2,2),z=c(5,8,4,3,4,1,6,3,3,6,3,5,7)) Supposing that data$y is a factor, I would like to find the Spearman correlation between data$x and data$z indexing it by data$y. To be more specific, I want to find two correlations: between x and z with y==1 and the same correlation with x and z where y==2. Something like: cor(data$x[data$y==1],data$z[data$y==1],method= "spearman") and cor(data$x[data$y==2],data$z[data$y==2],method= "spearman"), but without having to write all the values for data$y and use cor more than once. I hope I made myself clear. Thanks Mateus [[alternative HTML version deleted]]
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