Displaying 2 results from an estimated 2 matches for "cnd95".
2003 Mar 14
6
length() misbehaving?
I'm having a weird problem with length(), in R1.6.1 under windows2000. I have a
dataframe called byyr, with ten columns, the first of which is named cnd95.
summary(byyr) shows that byyr$cnd95 contains the factor level "tr" 66 times. Also,
when I enter byyr$cnd95 at the command line, I can count 66 "tr" elements in the
resulting vector. However, when I enter
n95trt <- length(byyr$cnd95[byyr$cnd95=="tr"])
n95trt
the...
2003 Mar 14
1
Fw: length() misbehaving?: More
With the problem below, I've discoved that
n95trt<-length(byyr$cnd95[byyr$cnd95=="tr"&!is.na(byyr$cnd95)])
does give me the correct count for the number of "tr" entries. (The same behavior
occurs for the "c" level of the cnd95 factor.) It appears that
byyr$cnd95=="tr"
is finding both "tr" AND NA entries. Is th...