[R-sig-Geo] A question about gwr.morantest pvalue
Apostolis
atsiban at unipi.gr
Fri Feb 17 00:23:11 CET 2012
Dear list members
I am a new user of R and I would like to ask a question about the function
gwr.morantest which is included in the spgwr package.
According to the paper of Leung et al page 881
when
EQ.EQ3.gwr > 0 the pvalue of the test is P(chisqh<= chi2.gwr)
(equation 43)
and when
EQ.EQ3.gwr < 0 the pvalue is 1 - P(chisqh<= chi2.gwr) (equation 44)
However in the function gwr.morantest the estimations in the IF are
respectively:
if (EQ.EQ3.gwr > 0) {
chi2.gwr <- h.gwr - ((sqrt(2 * h.gwr) * EQ.gwr)/(sqrt(varQ.gwr)))
p.gwr <- 1 - pchisq(chi2.gwr, h.gwr)
}
else if (EQ.EQ3.gwr < 0) {
chi2.gwr <- (h.gwr + ((sqrt(2 * h.gwr) * EQ.gwr)/(sqrt(varQ.gwr))))
p.gwr <- pchisq(chi2.gwr, h.gwr)
}
Is it correct or there is an error? My problem is in the appearance of 1 in
p.gwr inside the IF.
I wish to use the gwr.morantest function in a simulation study and I would
like to know whether the function estimates the pvalue which is described in
the paper correctly.
Thanks in advance
Apostolis
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