search for: geertj

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2007 Oct 22
3
Spatial autocorrelation
...no autocorrelation in the residuals is obviously violated. Does anyone have any ideas how to incorporate these spatial effects in my analysis? I have been reading up on autoregressive techniques, but I am not sure if it works with more than one plot. All help is greatly appreciated! Many thanks, Geertje van der Heijden [[alternative HTML version deleted]]
2007 Nov 27
1
Difference between AIC in GLM and GLS - not an R question
...ave fitted a model using a glm() approach and using a gls() approach (but without correcting for spatially autocorrelated errors). I have noticed that although these models are the same (as they should be), the AIC value differs between glm() and gls(). Can anyone tell me why they differ? Thanks, Geertje ~~~~ Geertje van der Heijden PhD student Tropical Ecology School of Geography University of Leeds Leeds LS2 9JT Tel: (+44)(0)113 3433345 Email: g.m.f.vanderheijden04@leeds.ac.uk [[alternative HTML version deleted]]
2007 Sep 04
1
Robust linear models and unequal variance
...eal with unequal variance? And if it is better to use a non-parametric analysis, could anyone put me in the direction of the right non-parametric method to use (the relationship between my response variable and the covariates is linear)? Any help on this would be greatly appreciated! Many thanks, Geertje ~~~~ Geertje van der Heijden PhD student Tropical Ecology School of Geography University of Leeds Leeds LS2 9JT Tel: (+44)(0)113 3433345 Email: g.m.f.vanderheijden04@leeds.ac.uk [[alternative HTML version deleted]]
2007 Oct 26
1
Help needed on calculation of Moran's I
...viate = 0, p-value = 1 alternative hypothesis: two.sided sample estimates: Observed Moran's I Expectation Variance -1.754386e-02 -1.754386e-02 2.125706e-16 Can anyone tell me where I went wrong or if there is another way to generate a nb list? Many thanks, Geertje ~~~~ Geertje van der Heijden PhD student Tropical Ecology School of Geography University of Leeds Leeds LS2 9JT Tel: (+44)(0)113 3433345 Email: g.m.f.vanderheijden04@leeds.ac.uk [[alternative HTML version deleted]]
2007 Nov 16
1
Question about lmRob
...ANCOVA the order in which the variables are added to the model matters and that this influences the P-value, but can this make such a big difference? Which P-values are best to use? Also, could this be an indication something is wrong with my model? Any help would be greatly appreciated! Thanks, Geertje ~~~~ Geertje van der Heijden PhD student Tropical Ecology School of Geography University of Leeds Leeds LS2 9JT Tel: (+44)(0)113 3433345 Email: g.m.f.vanderheijden04@leeds.ac.uk [[alternative HTML version deleted]]
2007 Nov 20
1
Problem with code for bootstrapping chi square test with count data
...resamples. Does anyone have an idea on how to get this to work? Or is there another easier way to do this? I hope it is clear what I am trying to do! I have tried looking on the internet and in the R archives, but I can't find what I am looking for. Thanks very much in advance for your help! Geertje ~~~~ Geertje van der Heijden PhD student Tropical Ecology School of Geography University of Leeds Leeds LS2 9JT Tel: (+44)(0)113 3433345 Email: g.m.f.vanderheijden04@leeds.ac.uk [[alternative HTML version deleted]]