R-sig-mixed-models Digest, Vol 138, Issue 34

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I
appreciate any help on;



1- A book, paper or link on ordinal logistic regression (easy to read 
and understand for an average reader)

2- What is the preferred package in R to analyse such data? I noticed 
some have used "Ordinal" package.

3- Is it appropriate to use farm (n=3) as a random-effects in the 
model? I assume 3 is small to be considered as a random-effects in the 
model, your thoughts?

4- Because observations are repeated on 3 occasions (repeated 
measures), I intend to use animals as a random-effects.

5- If I use both research sites and animals as random-effects, I 
assume it would be a nested random-effects model?

6- I appreciate if someone can help with some R codes on ordinal 
logistic regression



Your help is greatly appreciated!



Ahmad










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Message: 2
Date: Sat, 23 Jun 2018 15:30:41 +0200
From: Paul Buerkner <paul.buerkner at gmail.com>
To: ahmadr215 at tpg.com.au
Cc: r-sig-mixed-models at r-project.org
Subject: Re: [R-sig-ME] mixed-effects ordinal logistic regression
        model
Message-ID:
        <CAGoSky___sd0xhDeEakt+J0SORs2gUnO_0v_qK_OQY8y-tg=Pw@
mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Hi Ahmad,

if you want to fit this model in a frequentist framework, I recommend 
the "ordinal" package. If you rather want to use a Bayesian framework, 
I recommend "brms". For a tutorial paper about ordinal models also 
containing R code for brms, see https://psyarxiv.com/x8swp/

Paul

2018-06-23 15:04 GMT+02:00 <ahmadr215 at tpg.com.au>:

Hi list



I have a dataset with n=60 animals with two groups (30/group; 
control and
treatment) on 3 different research sites. Animals are monitored on 
days

0,

14 and 28 (repeated measures), and lesions are scored from 1-4.



I want to use a mixed-effects ordinal logistic regression model and 
consider animals and research sites as random-effects in the model.

I haven't done ordinal logistic regression before, and I would like 
to

use

this data and learn how to do the analysis and also interpret the

outputs.

I
appreciate any help on;



1- A book, paper or link on ordinal logistic regression (easy to 
read and understand for an average reader)

2- What is the preferred package in R to analyse such data? I 
noticed

some

have used "Ordinal" package.

3- Is it appropriate to use farm (n=3) as a random-effects in the model?

I

assume 3 is small to be considered as a random-effects in the model, 
your thoughts?

4- Because observations are repeated on 3 occasions (repeated 
measures),

I

intend to use animals as a random-effects.

5- If I use both research sites and animals as random-effects, I 
assume

it

would be a nested random-effects model?

6- I appreciate if someone can help with some R codes on ordinal 
logistic regression



Your help is greatly appreciated!



Ahmad










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