[R] error message

[David Winsemius]

On Jan 18, 2011, at 6:09 PM, wangwallace wrote:

>
> Peter,
>
> I found it. There is a missing value under column SubID. I filled it  
> out
> with an ID number, and the error message never occur again. Although  
> I found
> the problem, I have no idea why would this be associated with such  
> an error
> message.

Please re-read the error message. It seems to (adequately) cover the  
situation you describe.

> If anybody else have some input, I would really appreciate it. :)

-- 
David Winsemius, MD
West Hartford, CT