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2012 May 23
0
gam (mgcv) vs. multiple regression breakpoint analysis: inconsistencies?
...haps I'm doing something wrong, but the results go
against my intuition.
With kind regards,
Martijn Wieling,
University of Groningen
### breakpoint analysis using lm, both with and without covariate
# note that AoEO indicates the AOA
# LR denotes Length of Residence
deviances1 = rep(Inf, 20)
deviances2 = rep(Inf, 20)
for (breakpoint in 6:20) {
	spk$ShiftedAoEO = spk$AoEO - breakpoint;
	spk$PastBreakPoint = as.factor(spk$ShiftedAoEO > 0);
	m1 = lm(LDlog ~ ShiftedAoEO:PastBreakPoint,data=spk)
	m2 = lm(LDlog ~ LR + ShiftedAoEO:PastBreakPoint,data=spk)
	deviances1[breakpoint] = deviance(m1)
	devia...