Hi all, I have three columns. Resistance, Time and Frequency, and I need to
find correlations between Resistance and Time by each of 100 Frequencies.
I have set Frequencies to be a factor. Time is in the format "%m/%d/%Y
%H:%M:%S", but correlations dont seem to like Time data.
I can run this code from Stackoverflow
library(plyr)
g <- data.frame(col1=rnorm(100, 1, 1), col2=rnorm(100, 10, 3),
col3=c(rep("a", 50), rep("b", 50)))
co <- ddply(g, .(col3), function(adf) cor(adf[,1], adf[,2]))
But if one of the columns is Time, it does not work. So the functionality
of giving correlations by Frequency works, but not when Time is used.
I hope this is clear enough.
keith
M. Keith Cox, Ph.D.
Principal
MKConsulting
17415 Christine Ave.
Juneau, AK 99801
U.S. 907.957.4606
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
