[R] Why isn't R recognising integers as numbers?

[Ted Byers]

I have a number of files containing anywhere from a few dozen to a few
thousand integers, one per record.

The statement "refdata18 =
read.csv("K:\\MerchantData\\RiskModel\\Capture.Week.18.csv", header =
TRUE,na.strings="")" works fine, and if I type refdata18, I get the integers
displayed, one value per record (along with a record number).  However, when
I try " fitdistr(refdata18,"negative binomial")", or hist.scott(refdata18,
prob = TRUE), I get an error:

Error in fitdistr(refdata18, "negative binomial") : 
  'x' must be a non-empty numeric vector
Or
Error in hist.default(x, nclass.scott(x), prob = prob, xlab = xlab, ...) : 
  'x' must be numeric

How can it not recognise integers as numbers?

Thanks

Ted
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