On Mar 20, 2012, at 7:52 PM, Laura Rodriguez Murillo wrote:
Dear list,
I have a data frame where one of the columns are p values with
scientific
notation mixed with regular numbers with decimals.
a=data frame
a
P OR N
0.50 0.7500 237
0.047 1.1030 237
0.124 0.7742 237
0.124 0.7742 237
0.0080 1.1590 237
0.50 0.7500 237
4.5e-07 1.2 237
5.6e-04 0.9 237
when I try to do
pval=a$P/2
R gives me an error saying "In Ops.factor(pval, 2) : / not
meaningful for
factors"
It is a complete mystery to me that people don't believe the error
messages. a$P is a factor. Something you did created a factor
(probably at data entry time), and you didn't realize it. You can
change it to numeric with:
a$P <- as.numeric(as.character(a$P))
--
David Winsemius, MD
West Hartford, CT
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