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pkr
2009 May 06
1
Add trend line to XYPlot using a subset of the original data
...The additional trend line always has the wrong slope. The slope of
the line should be close to zero, but positive. It always plots close to
zero, but negative.
I've tried adding the following lines to the above
panel.lines(x[21:98],exp(predict.lm(lm(log(y[21:98])~x[21:98]))),col=5)
or
pkyr<-x>1927
panel.lines(x[pkyr],exp(predict.lm(lm(log(y[pkyr])~x[pkyr]))),col=4)
or
pkyr<-x>1927
my.lm<-lm(log(y[pkyr])~x[pkyr])
panel.lines(x[pkyr],exp(x[pkyr]*(my.lm$coef[2])+my.lm$coef[1]),col=3)
or
panel.lines(x[pkyr],exp(x[pkyr]*(-my.lm$coef[2])+my.lm$coef[1]),col=3)...