search for: hunua

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2008 Oct 10
0
Problems and bugs in vgam()
...models for zero-altered negative binomial models. 1. When fitting smoothed parameters (e.g. s(X, df=2)) changing the degrees-of-freedom has no effect on the level of smoothing (e.g. number of knots for the spline). This appears to be the case even for the example on the vgam help page. data(hunua) fit2 = vgam(agaaus ~ s(altitude, df=2), binomialff, hunua) > coef(fit2) (Intercept) s(altitude, df = 2) -1.1661259280 0.0003932463 fit10 = vgam(agaaus ~ s(altitude, df=10), binomialff, hunua) > coef(fit10) (Intercept) s(altitude, df = 10) -1.1661...