That was the mistake. Now it worked. Thanks a lot, Roman and Olmo and thanks for the recommendation on the code editor!
Carolina 2012/2/5 Olmo <[email protected]> > Hi Carolina, it could be a syntaxis ommition indeed, I see a space > that I think it must not be there, between < and the minus - , > (probably = is simpler but I use <- too): > > > step.forward < - ordistep(rda(main ~ 1, data=second), > scope=formula(RDA.all), direction="forward", pstep=1000) > > > step.forward <- ordistep(rda(main ~ 1, data=second), > scope=formula(RDA.all), direction="forward", pstep=1000) > > Check that, just in case. > > Hope this helps, > Olmo. > > > El Sat, 4 Feb 2012 15:03:08 -0400 > carolina monmany <[email protected]> escribió: > > Dear all, > > > > I am running a redundancy analysis in vegan and I am using ordistep to > > perform a forward selection of variables in my model. I'm following > > Borcard et al. (2011) for this. I got stuck in one of the steps and > > couldn't find out why. > > > > > RDA.all <- rda(main ~ ., data=second) > > > RDA.all > > Call: rda(formula = main ~ MeanAsp + SDAsp + MenaSlo + SDSlo + Urban + > > Treelines + TreeGroups + > > SolTress + IntermGrass + TallGrass + Highways + Canals + DistDCA + > > MeanTrackDens + SDTrackDens + > > MeanMagnetism, data = second) > > > > Inertia Proportion Rank > > Total 0.005999 1.000000 > > Constrained 0.005999 1.000000 9 > > Unconstrained 0.000000 0.000000 0 > > Inertia is variance > > Some constraints were aliased because they were collinear (redundant) > > > > Eigenvalues for constrained axes: > > RDA1 RDA2 RDA3 RDA4 RDA5 RDA6 RDA7 > > RDA8 RDA9 > > 4.421e-03 1.406e-03 8.930e-05 5.354e-05 1.413e-05 8.836e-06 4.612e-06 > > 1.324e-06 3.500e-07 > > > > # And here's the problem, > > > > > step.forward < - ordistep(rda(main ~ 1, data=second), > > scope=formula(RDA.all), direction="forward", pstep=1000) > > Error: object 'step.forward' not found > > > > I hope it's a syntaxis ommition or error. Any clue? > > > > Thanks a lot, > > > > Carolina > > > > > _______________________________________________ > R-sig-ecology mailing list > [email protected] > https://stat.ethz.ch/mailman/listinfo/r-sig-ecology > -- --------------------------- A. CAROLINA MONMANY Universidad de Puerto Rico Departamento de Biologia - CN 235 POBOX 23360 San Juan, Puerto Rico 00931-3360 Tel: +1 787 764 0000 x2847 Fax: +1 787 764 2610 [[alternative HTML version deleted]]
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