Re: [R-sig-eco] Fitting a GLMM to a percent cover data with glmer or glmmTMB

Hi, I agree with Zoltan that bionimial is probably inappropriate, for the reasons he stated. I'm not sure that Tweedie is your solution though -- it is defined for non-negative real numbers.  Not just those between 0 and 100%.  Perhaps easiest to think of fish biomass caught in a net (can be

Re: [R-sig-eco] How to manipulatechange the space between the numbers of axes (equal interval)? How to add a legend to a map (plot raster)?

Hello Lara, Did you try just using the plot function? Something like this: plot(proj22PA) Cheers, *Karlo Gregório Guidoni Martins* PhD Student in Ecology and Evolution Community Ecology and Functioning Lab Universidade Federal de Goiás - Brazil skype: kguidonimartins +55 28 9 9992 2969 On

Re: [R-sig-eco] Fitting a GLMM to a percent cover data with glmer or glmmTMB

Hi, Have a look at the gamlss library that has three beta inflated families. Cheers Javier -Original Message- From: R-sig-ecology On Behalf Of scott.fos...@data61.csiro.au Sent: Friday, 30 November 2018 8:57 a.m. To: r-sig-ecology@r-project.org Subject: Re: [R-sig-eco] Fitting a GLMM

Re: [R-sig-eco] Fitting a GLMM to a percent cover data with glmer or glmmTMB

I have to correct myself :),  because an important point is missing from this sentence: Binomial distribution are defined as number of successes in independent trials. correctly: Binomial distribution are defined as number of successes in FIXED NUMBER OF independent trials. Zoltan 2018.

[R-sig-eco] mvabund: difference between 'glm1path' and 'manyglm'

Hi David and list, Can someone please help me understand why, when changing the 'method=manyglm' argument to 'method=glm1path' under default settings (negative binomial) the estimates of theta change in the 'trait.glm' function? I have provided example code below us the antTraits data set. And

Re: [R-sig-eco] Fitting a GLMM to a percent cover data with glmer or glmmTMB

Hi, I'm sure that binomial is unsuitable for relative cover. Binomial distribution are defined as number of successes in independent trials. I think this scheme cannot be applied to relative cover or visually estimated cover. It is important because both number of trials and probability of

Re: [R-sig-eco] [EXTERNAL] Re: Fitting a GLMM to a percent cover data with glmer or glmmTMB

Beta regression can be used for modeling proportion (or percentage) cover data, but there are some issues with using it if you have many values of 0.0 or 1.0. A much more flexible approach that I've used is to use quantile regression with the proportion response (y) data logit transformed. Much

Re: [R-sig-eco] Fitting a GLMM to a percent cover data with glmer or glmmTMB

Thanks Zoltan. Using the glmmTMB with tweedie is the option that I can now discern... Vasco Botta-Dukát Zoltán escreveu no dia quinta, 29/11/2018 à(s) 14:33: > I have to correct myself :), because an important point is missing from > this sentence: > > Binomial distribution are defined as

[R-sig-eco] Advanicng in R for ecologists

Advancing in statistical modelling for evolutionary biologists and ecologists using R (ADVR08) https://www.prstatistics.com/course/advancing-statistical-modelling-using-r-advr08/ This course will be delivered by Dr. Luc Bussiere from the 21st 25th January 2019 in Glasgow City Centre Course

[R-sig-eco] How to manipulatechange the space between the numbers of axes (equal interval)? How to add a legend to a map (plot raster)?

Hello, I´m trying to plot a map in R. Is it possible to change the values of x.axis and y.axis and have the same interval (space between the numbers)? How to add a legend for the map? https://www.dropbox.com/s/60tavy6vez33mw3/Plot_map.tiff?dl=0 >