Hi! I would like to calculate a constrained additive ordination with the package VGAM. I get the error message: Error in ncol(xbig.save) : object "xbig.save" not found My data consists of 90 samples, 10 species and 3 environmental variables. The species data is continous biomass data, with values from 0 to 3000 micrograms per litre. I use the function: cao (name.of.species.matrix~Temp+LF+Ptot, data=name.of.environmental.data.frame, family=gaussianff, df1.nl=3.5, Bestof=4) After fitting model 1, I get an error message. Here is the output of model 1: Obtaining initial values Using initial values Temp LF Ptot lv 0.408 0.189 -0.77 Iteration 1 initial value 88934920.105286 iter 10 value 83029461.332581 iter 20 value 83028498.211367 final value 83028488.241532 converged Error in ncol(xbig.save) : object "xbig.save" not found I have tried it with fewer or more sites, fewer and more species, df1.nl from 0.5 to 5.5. I always get the same error message. It only works when I use family=poissonff. But as I have continuous data, I think I can't use poissonff. Can anybody help me? Thanks, Romana ------------------------------------------- Versendet durch aonWebmail (webmail.aon.at)