[R-sig-Geo] error message when running errorsarlm

[Roger Bivand]

On Tue, 20 May 2008, evans324 at umn.edu wrote:

> Hi, 
> I'm working on Windows with 2GB RAM and am trying to run the errorsarlm with 
> 32 predictor variables and 10,071 records. I created my listw object using 
> the dnearneigh function with an upper distance limit of 3000m. I used the 
> following code with method=Matrix to deal with memory limitations:
>
> rams_dak3k.err <- errorsarlm(LN_PRICE~., data=reg_vars, 
> rams_dak.dnear3k.listw, zero.policy=TRUE, method="Matrix")
>
> When I run this, I get the following error message repeated many times:
>
> Error in stop(gettextf("no method or default for coercing \"%s\" to \"%s\"", 
> :
> no function to return from, jumping to top level
> In addition: Warning message:
> In optimize(sar.error.f.M, interval = interval, maximum = TRUE,  :
>  NA/Inf replaced by maximum positive value

A bit more context would help. The output of sessionInfo() at least (R and 
package versions may matter), plus the preceding code, including the 
definition of rams_dak.dnear3k.listw - is it row-standardised? Running 
traceback() immediately after the error would also be helpful to see where 
in functions called by sar.error.f.M() the problem is occurring. If I 
understand correctly, the error messages cycle, but the rams_dak3k.err 
object is created? Could you run it with quiet=FALSE, so see the function 
values as they are generated in optimize()? The NAs usually come from the 
interval= being too broad wrt. your weights style.

Roger

>
> I am not sure what this message means. Should I trust the results? Should I 
> run the function differently. I appreciate any advice anyone can offer me.
>
> Thanks,
> Heather Sander
>
>
>

-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no