[R] cross-validation

[Trevor Wiens]

I've been looking at the base and Design libraries and it is unclear to me the best way to approach doing cross-validation. I'm interested in using temporal (I have five years of data), spatial (I've divided my data set up into 5 blocks that make sense and have a block variable attached to my data) and I was also thinking of doing a random cross-validation to look at general model stability. For the third options I can use cross-validation or bootstrapping.

If someone can type out a code example, that would be very helpful to me. 

Thanks in advance.

T
-- 
Trevor Wiens 
twiens at interbaun.com

The significant problems that we face cannot be solved at the same 
level of thinking we were at when we created them. 
(Albert Einstein)