[R] cannot calculate standard estimate with predict on loess

[David Winsemius]

On May 3, 2012, at 7:10 PM, Saurav Pathak wrote:

> Hi,
>
> For some reason I have been unable to use the predict function when  
> I desire the standard error to be calculated too.  For example, when  
> I try the following:
>
> l<- loess(d~x+y, span=span, se=TRUE)
> p<- predict(l, se=TRUE)
>

I don't know what effect the se=TRUE will have in the first call. As  
far as I can tell there is no such argument to loess(). Could it be  
that the extranous argument is have an adverse effect on the effort to  
later use predict (which does have such an argument.)?
>
> I get the following error message:
>
> Error in vector("double", length) : vector size cannot be NA
> In addition: Warning message:
> In N * M1 : NAs produced by integer overflow
>
>
> But when I try the following:
>
> l<- loess(d~x+y, span=span, se=TRUE)
> p<- predict(l, se=FALSE)
>
>
> I have no problem, and p$fit gives me the desired fitted values.   
> Note that the only difference in this piece of code is se=FALSE.
>
> My data d is a vector, and x and y are vectors too of the same length.
>
> Any help will be greatly appreciated.
>
> Thanks,
> Saurav
>
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT