An alternative way of getting summary statistics by a grouping
variable is to use describe.by in the psych package:
using Jim Lemon's example:
library(psych)
testmat<-data.frame(sample(1:14,50,TRUE),rnorm(50),runif(50)) #make
up the data
describe.by(test.mat,testmat[1] #get descriptive statistics
At 8:17 AM -0800 12/13/10, effeesse wrote:
what am I supposed to put into function(x)? The indicator for extracting the
subgroups?
data is the df. cluster={1,...,14}.
This is how I was compiling:
"for (i in 1:14) {
my.summary<-data$cluster==i c(mean(?),var(?))
summary(var_A~cluster, fun=my.summary,data=data)
summary(var_B~cluster, fun=my.summary,data=data)
summary(var_C~cluster, fun=my.summary,data=data)
summary(var_D~cluster, fun=my.summary,data=data)
summary(var_E~cluster, fun=my.summary,data=data)
summary(var_F~cluster, fun=my.summary,data=data)
summary(var_G~cluster, fun=my.summary,data=data)
}"
thanks for your patience.
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