R help - Oct 2012 - stepAIC in R

My stepAIC function works for one set of data but not another....one set 
of data shows the steps of eliminating variables, versus another set of 
data doesn't throw away any variables.

Can anyone please explain why?  Thanks

______________________________________________________________________
The information transmitted, including any attachments, is intended only for the
person or entity to which it is addressed and may contain confidential and/or
privileged material. Any review, retransmission, dissemination or other use of,
or taking of any action in reliance upon, this information by persons or
entities other than the intended recipient is prohibited, and all liability
arising therefrom is disclaimed. If you received this in error, please contact
the sender and delete the material from any computer. PricewaterhouseCoopers LLP
is a Delaware limited liability partnership.  This communication may come from
PricewaterhouseCoopers LLP or one of its subsidiaries.

	[[alternative HTML version deleted]]

On 03.10.2012 19:48, liang.che at us.pwc.com wrote:
> My stepAIC function works for one set of data but not another....one set
> of data shows the steps of eliminating variables, versus another set of
> data doesn't throw away any variables.
>
> Can anyone please explain why?
Without data nor output? No.

If there is no further output nor error message, we can guess: The AIC 
cannot be reduced by omitting variables.


Uwe Ligges





Thanks
>
> ______________________________________________________________________
> The information transmitted, including any attachments, is intended only
for the person or entity to which it is addressed and may contain confidential
and/or privileged material. Any review, retransmission, dissemination or other
use of, or taking of any action in reliance upon, this information by persons or
entities other than the intended recipient is prohibited, and all liability
arising therefrom is disclaimed. If you received this in error, please contact
the sender and delete the material from any computer. PricewaterhouseCoopers LLP
is a Delaware limited liability partnership.  This communication may come from
PricewaterhouseCoopers LLP or one of its subsidiaries.
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>