[R] reading csv-data

[Thomas Lumley]

On Fri, 17 Jun 2005, Johanna Sundvik wrote:
> However, this "Mean1" is categorical when it should be real numbers.
>
>> Mean1
> [1] 4.4332  8.5113  35.1624 9.1693  2.974   65.1578 43.2241 3.1278  5.3364
> Levels: 2.974 3.1278 35.1624 4.4332 43.2241 5.3364 65.1578 8.5113 9.1693
>
> Why R does not understand that this should be real numbers? What am I doing
> wrong here? Thanks for your help.
>

Your files must have some entries that are not numbers, such as "." or 
something.  R then can't tell that the field is supposed to be numeric. 
This may happen with missing data, in which case the na.strings= argument 
can be used to tell R how missing data are specified.

You can convert the data to numeric as described in FAQ 7.10

 	-thomas