search for: divcularb

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2005 Nov 12
0
Error message in polr
...list, I'm fitting ordinal regressions using polr, and in some models I get the error copied below. Dependent variable is an ordered factor of bird abundance categories, and predictors are continuous habitat variables. > ro6 <- polr(formula = abun ~ InOmbrot + Oliva.OC + ToCultAr + DivCulArb + AltitMax + COORXY) > summary(ro6) Re-fitting to get Hessian Error in La.svd(x, nu, nv, method) : error code 8 from Lapack routine dgesdd In addition: Warning messages: 1: NaNs produced in: dlogis(x, location, scale, log) 2: NaNs produced in: dlogis(x, location, scale, log) But if I call...