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...this where Probit Analysis is involved? (5) I've also seen mentionings of maximum likelihood (ML), and ML values are given in the survreg output for the base and full models. Where does ML get involved in the calculations? Thanks! -Eric --- Eric B. Peterson, Ph.D. Vegetation Ecologist & Lichenologist Nevada Natural Heritage Program and (adjunct) UNR Dept. NRES [[alternative HTML version deleted]]

...argument is not of mode character" and v1 <- t["Var1"] v2 <- t["Var2"] plot(v1, v2) gives me the same error (of course) and v1 does not display the same as a vector; it looks like it is an array(?) Thanks, -Eric --- Eric B. Peterson Vegetation Ecologist & Lichenologist Nevada Natural Heritage Program Department of Conservation and Natural Resources 1550 E. College Pkwy #137 Carson City, NV 89706 775-687-4245 x236 http://heritage.nv.gov/