Dear all,
I need to adjust a decaing function between "preference" as function
of "distance" (dst). As you can see below, the X values range from
highly negative to higly positive. The preferences range from 1 to ~0.
I tryed to use drc() packages, but I I am not wrong, the packages
is developed mainly to responde-dose, so the X is from 0-infinite.
I need to fit the data and get an assintoptic (inverse-S) shape.
Any help are welcome.
milton
brazil-toronto
---
sp.coredep.attr<-read.table(stdin(), head=T, sep=",")
species,dst,preference,probdye
coredep,-7500,1,0.001
coredep,-1000,0.95,0.002
coredep,-500,0.9,0.003
coredep,-250,0.8,0.005
coredep,-120,0.7,0.01
coredep,-100,0.5,0.02
coredep,-90,0.3,0.03
coredep,-60,0.2,0.05
coredep,-30,0.15,0.065
coredep,0,0.1,0.08
coredep,30,0.09,0.1
coredep,60,0.08,0.15
coredep,90,0.07,0.2
coredep,120,0.06,0.3
coredep,240,0.05,0.4
coredep,500,0.04,0.5
coredep,1000,0.02,0.6
coredep,7500,0.01,0.7
plot(preference~as.factor(dst), data=sp.coredep.attr, type="n", cex=0.001,
col="transparent", xlab="Distance (m)", main="CORE Dependent")
lines(sp.coredep.attr$preference, type="b", lwd=2, col="blue")
abline(v=10, col="blue", lty=3)
text(10, 1, "EDGE", cex=1.5)
text(7, 1, "CORE", cex=1.5, col="green")
text(13, 1, "MATRIX", cex=1.5, col="red")
text(4,0.65, "Preference", col="blue")
text(16,0.65, "Prob.Die", col="red")
lines(sp.coredep.attr$probdye, type="b", lwd=2, col="red", lty=2)
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