There are two issues here. First, your original factor seems to have 4
levels: " F", " M", "F", "M". Note the extra space in front of the
first two F and M. You may want to fix that first:
gender.fixed = sub(" ", "", as.character(data$gender))
Check that everything is correct by typing
table(gender.fixed)
or
table(data$gender, gender.fixed)
Then you can convert the fixed gender back to a factor, but pay
attention to the levels:
data$gender = factor(gender.fixed, levels = c("F", "M"))
Hopefully this works,
Peter
On Sat, Jul 11, 2015 at 12:21 PM, Dagmar Juranková
<dagmar.jura...@gmail.com> wrote:
> Hello everybody, I have a problem with R.
>
>
> I uploaded a questionnaire saved as csv into R and I tried to test
> independence between two variables.
>
>
>
> data <- read.csv("C:/Users/Me/Desktop/data.csv")> View(data)> df =
> read.csv("C:/Users/Me/Desktop/data.csv")> ls()
> [1] "df" "data"> attributes(data$gender)
> $levels
> [1] " F" " M" "F" "M"
>
> $class
> [1] "factor"
>
>
> I changed my variable "gender" into a factor using:
>
>
> data$gender=factor(data$gender, levels=c(1:2), labels= c( "F", "M"),
> exclude= NA, nmax= NA).
>
>
> Then I wrote data$gender and the only thing i got was:
>
>
> [1] <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA>
> <NA> <NA> <NA> <NA> <NA> <NA>
>
> [21] <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA>
> <NA> <NA> <NA> <NA> <NA> <NA>
>
> [41] <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA>
> <NA> <NA> <NA> <NA> <NA> <NA>
>
> [61] <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA>
>
> Levels: F M
>
>
> Does anybody know why?
>
>
> -My csv doc in the column gender is filled out properly. (M=Male, F= Female)
>
> -My imported dataset in R is complete (all values)
>
>
> ! I have done this with a different excel document and it worked out
> without any problems. I am really clueless. I cant go further and compare
> the variables and do t-tests without this working.
>
>
> Could someone please help me out?
>
> Thank you.
>
> [[alternative HTML version deleted]]
>
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