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hemel
2005 Jul 19
2
Regression lines for differently-sized groups on the same plot
...the pieces of
the curve so that I get a solid line rather than small dots and dashes where
actual data exist. Thanks so much for your help!
Laura Marx
Michigan State University, Dept. of Forestry
#Note: hemdata has all the rows that are not hemlock species replaced with
#"NA"s.
hemhem=glm(hempresence~logarea, family=binomial(logit), data=hemdata)
hemyb=glm(hempresence~logarea, family=binomial(logit), data=birchdata)
hemsm=glm(hempresence~logarea, family=binomial(logit), data=mapledata)
attach(logreg) #logreg is the full dataset
plot(logarea, hempresence, xlab = "Surface a...