Thanks again Michael, simple enough!
r1z <- r1
str(r1z$B1)
#Factor w/ 14 levels "Z","A","C","D",..: 2 2 3 3 2 2 2 2 2 2 ...
# When you do your step of replacing lower case l with upper case L the
# level still stays in the factor even though it is empty. If that is a nuisance
r1z$B1 <- factor(r1z
Hi Jeff and Michael, thank you for your quick responses and suggestions I will
try them out.
Appreciate everyone's time!
WHP
My suggestion is to avoid converting the column to a factor until it is cleaned
up the way you want it. There is also the forcats package, but I still prefer
to work
Thank you Bert.
WHP
As usual, careful reading of the relevant Help page would resolve the confusion.
from ?factor:
"factor(x, exclude = NULL) applied to a factor without NAs is a
no-operation unless there are unused levels: in that case, a factor
with the reduced level set is returned. If excl
My suggestion is to avoid converting the column to a factor until it is cleaned
up the way you want it. There is also the forcats package, but I still prefer
to work with character data for cleaning. The stringsAsFactors=FALSE argument
to read.table and friends helps with this.
On November 16,
Dear Bill
When you do your step of replacing lower case l with upper case L the
level still stays in the factor even though it is empty. If that is a
nuisance x <- factor(x) will drop the unused levels. There are other
ways of doing this.
Michael
On 16/11/2018 15:38, Bill Poling wrote:
Hel
As usual, careful reading of the relevant Help page would resolve the confusion.
from ?factor:
"factor(x, exclude = NULL) applied to a factor without NAs is a
no-operation unless there are unused levels: in that case, a factor
with the reduced level set is returned. If exclude is used, since R
ve
Hello:
I am running windows 10 -- R3.5.1 -- RStudio Version 1.1.456
I would like to know why when I replace a column value it still appears in
subsequent routines:
My example:
r1$B1 is a Factor: It is created from the first character of a list of CPT
codes, r1$CPT.
head(r1$CPT, N= 25)
[1] A4
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