Hi All:
I came across the following problem while working with a dataset, and
wondered if there could be a solution I sought here.
My dataset consists of information on 402 individuals with the followng five
variables (age,sex, status = a binary variable with levels case or
control, mma,
The variables mma, and dma are actually numerical variables but in the
dataframe, they are represented as characters. I tried to change the
type
of the variables (from character to numeric) using the edit function (and
bringing up the data grid where then I made changes), but the changes were
The message probably means that the variable is a character variable and
not numerical (as you intended) nor factor.
Although you said there was a trip to epiinfo, you never said where the
data came from. Try dumping out the data, editing the file, and reading
it with read.table. There are
I sympathize with your trouble bringing in data, but you need to catch
your breath and figure out what you really have. I think when you get a
bit more R practice, you will be able to manage what you bring in
without going back to that editor so much.
I feel certain your data is not what you
