[R] Re :argument is not numeric or logical

[David Winsemius]

On May 2, 2010, at 10:22 AM, Mohan L wrote:

>
>
>
>
> Your code has a different name for the sample object. And it would  
> be more informative if you offered str on "sample1".
>
> This is the result of str on "sample1".
> > str(sample1)
> 'data.frame':    35943 obs. of  17 variables:
>  $ stdate     : Factor w/ 7 levels "01/11/09 00:00",..: 1 1 1 1 1 1  
> 1 1 1 1 ...

So stdate is not a date variable but that is probably not your problem  
since it looks like the time portion of your not-dates are all  
"00:00". tapply can work with this information

>
snipped

>  $ Login      : Factor w/ 419 levels ".00","1.00","10.00",..: 114  
> 283 217 216 14 1 2 2 407 327 ...

So "Login" is not a numeric class variable. Read the FAQ about the  
proper way to convert that variable to numeric without loosing  
information.

-- 
David.


>  $ EISent     : Factor w/ 250 levels ".00","1.00","10.00",..: 1 132  
> 23 132 2 1 1 1 1 2 ...
>  $ EIReceived : num  12 5 43 0 8 2 11 12 4 0 ...
>  $ PMSent     : Factor w/ 298 levels ".00","1.00","10.00",..: 1 1 1  
> 1 1 1 1 1 1 1 ...
>  $ PMReceived : num  8 4 61 1 12 8 0 9 1 0 ...
>
>
> What I am trying is:  I have 7 days data in .csv format. I need to  
> the average Login for first day(1/11/2009) , from this average I  
> have to calculate index divisor(ID). Then I have to calculate the  
> average Login for all 7 days and need to multiple each day Login  
> average with   index divisor(ID), like this
>
> stdate             LoginAverage       Index
> 1/11/2009          29.50                     LoginAverage*ID
>
> This what I am trying? Any help will be appreciated
>
> Thanks for your time.
>
> Thanks & Rg
> Mohan L
>
>
>

David Winsemius, MD
West Hartford, CT