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R-USERS-L  2018

R-USERS-L 2018

Subject:

Re: Mixed effect models

From:

"Chaudhary,Vratika" <[log in to unmask]>

Reply-To:

UF R Users List <[log in to unmask]>

Date:

Wed, 18 Jul 2018 12:41:18 +0000

Content-Type:

text/plain

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Parts/Attachments

text/plain (1 lines)

Dr. Bolker

Thank you for reply. I am comparing models where species is included as random effect, versus, not included at all.

Vratika

On 18-Jul-2018, at 8:21 AM, Ben Bolker <[log in to unmask]<mailto:[log in to unmask]>> wrote:

 That context makes perfect sense.  My opinion would be that you should
go ahead and include random effects of species and study (or
author/research group) in the model as random effects.  Are you
comparing models where (e.g.) species is included as a fixed vs a random
effect, or comparing models where species is included as a random effect
vs models where it is not included at all?



On 2018-07-17 03:47 PM, Chaudhary,Vratika wrote:
Thank you for the reply. I have a dataset where a ‘success’ (good )
or ‘failure’ (bad) of a series of questions for individual datapoint
(publication) depend on the conservation status of the study species,
year of publication and the kind of model used amongst other things.
On performing logistic regression using only the fixed effects, one
of the concern of reviewers was if  we looked into the effect of the
same species and same authors in the model. So I chose mixed effect
models to account for pseudo replications in the data.

And on performing model selection, there isn’t a whole lot difference
between models with fixed and random effect. And I couldn’t find a
whole lot of resources to make that selection, or to perform model
averaging between the effects. I will appreciate any input on this
and please let me know if I can explain the contact in more details.

thank you Vratika

On 17-Jul-2018, at 3:17 PM, Ben Bolker <[log in to unmask]<mailto:[log in to unmask]>> wrote:

I don't. I have to say I'm not even a fan of the model-*testing*
approach to choosing between fixed and random effects (i.e. the
Hausman test, mostly used in econometrics); I would prefer to
choose fixed vs random for a particular effect on first principles
(or on pragmatic grounds, e.g. I don't have enough levels/the model
is singular). Can you give more context/say more about your goals?
On Tue, Jul 17, 2018 at 2:34 PM Chaudhary,Vratika
<[log in to unmask]<mailto:[log in to unmask]>> wrote:

Hi everyone

It's less of R , and more of stats question. Does anyone have
links/resources/literature on model averaging between fixed and
random effects logistic regression models. Or know if model
averaging between these two groups is a correct approach?

Thank you Vratika

This list strives to be beginner friendly.  However, we still ask
that you PLEASE do read the posting guide
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.R-2Dproject.org_posting-2Dguide.html&d=DwIDAg&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3MJaagrtDUL79e1ACXZji8lYXjs07_ujkEIg1it6gQ0&m=yQpUGW7CoTvv2GqLd59yrYKI1wUvzkK2RB7EsMQxQ10&s=_IJEmrcG2xfBR0I9o76-8U9ZDmC4Kz4NP80Vnq64Ptk&e=


and provide commented, minimal, self-contained, reproducible code.

This list strives to be beginner friendly.  However, we still ask
that you PLEASE do read the posting guide
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.R-2Dproject.org_posting-2Dguide.html&d=DwIDaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3MJaagrtDUL79e1ACXZji8lYXjs07_ujkEIg1it6gQ0&m=5URDJ_EmfAHq5LlYEewZAceOSezxBLpxFIZTR2U66RY&s=-6ek5k1dtiORkOBAV7SVzchMIjg4vd6WRvirJMZWYZU&e=


and provide commented, minimal, self-contained, reproducible code.

This list strives to be beginner friendly.  However, we still ask
that you PLEASE do read the posting guide
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.R-2Dproject.org_posting-2Dguide.html&d=DwIDaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3MJaagrtDUL79e1ACXZji8lYXjs07_ujkEIg1it6gQ0&m=5URDJ_EmfAHq5LlYEewZAceOSezxBLpxFIZTR2U66RY&s=-6ek5k1dtiORkOBAV7SVzchMIjg4vd6WRvirJMZWYZU&e=


and provide commented, minimal, self-contained, reproducible code.


This list strives to be beginner friendly.  However, we still ask that you
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
and provide commented, minimal, self-contained, reproducible code.


This list strives to be beginner friendly.  However, we still ask that you
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

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