search for: coredep

...y 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,...