On Wed, 14 Mar 2012, Roger Bivand wrote:
On Tue, 13 Mar 2012, Smit, M.J. wrote:
Dear list,
I'm trying to do a scenario analysis by changing a few values in the
dataset, and running 'predict' from spdep both before and after. However, I
get 'non-comformable arguments', even when I just add the old dataset as
'newdata='. What is happening?
Please do provide reproducible cases. This isn't, as you neither use built in
data, nor a link to your own data.
Also always name arguments to functions as this disambiguates the calls, and
avoids helpers having to look the arguments up.
This may or may not be the case in question:
library(spdep)
data(boston)
gp2 <- lagsarlm(log(CMEDV) ~ CRIM + ZN + INDUS + CHAS + I(NOX^2) + I(RM^2)
+ AGE + log(DIS) + log(RAD) + TAX + PTRATIO + B + log(LSTAT) + TOWN,
data=boston.c, nb2listw(boston.soi), method="eigen", tol.solve=1e-12)
p2 <- predict(gp2, newdata=boston.c, listw=nb2listw(boston.soi))
# Error in X %*% B : non-conformable arguments
summary(gp2) # NA coefficients
because predict() assumed that the user checked the model fit for
aliasing. A fix for predict() will be in the next spdep, but users really
should check that fitted coefficients are not aliased by colinearity.
Roger
Roger
My lagsarlm runs fine; so does the first prediction ("pred1"). It is the
second one that fails.
A sample of my code:
dat2 <- data.frame(NUTS_ID,COUNTRY,SPEND,<and 20 other variables> )
wgdist2 <- mat2listw(matgdist,dat2$NUTS_ID)
durbland <- lagsarlm(form_land,dat2,wgdist2,type="mixed")
summary(durbland)
pred1 <- predict(durbland,NULL,wgdist2,zero.policy=TRUE)
pred2 <- predict(durbland,dat2,wgdist2,zero.policy=TRUE) # Note this fails,
although the data is identical.
... and the last command always gets me
Error in X %*% B : non-conformable arguments
even before I get to executing
dat2$SPEND[dat2$COUNTRY=="PL"] <- dat2$SPEND[dat2$COUNTRY=="PL"]*2
Best regards,
Martijn
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--
Roger Bivand
Department of Economics, NHH Norwegian School of Economics,
Helleveien 30, N-5045 Bergen, Norway.
voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: roger.biv...@nhh.no
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