[R] tips for looping over a category for beginner

[David Winsemius]

On Jan 18, 2011, at 7:32 PM, Ben Harrison wrote:

> On 18 January 2011 22:52, Peter Ehlers <ehlers at ucalgary.ca> wrote:
>
>> Since you don't provide data, let's borrow from the
>> help(droplevels) page:
>>
>
> As an aside, is it normal practice then to attach data files to  
> questions on
> this mailing list? I might do that in future if it's possible and
> acceptable.

PLEASE. (re?-)read the Posting Guide.

> Ben.
>
> 	[[alternative HTML version deleted]]
>
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> and provide commented, minimal, self-contained, reproducible code.

David Winsemius, MD
West Hartford, CT