[R-sig-ME] sample size in glmer model

Thierry Onkelinx th|erry@onke||nx @end|ng |rom |nbo@be
Wed Jan 22 15:44:56 CET 2020


Dear Sou,

I'd suggest at least 10-15 observation per **parameter**. Categorical
variables with more than two levels require more than one parameter. An
interaction between two continuous variable requires 3 parameters (2 main
effect + 1 interaction). Don't forget to count the hyperparameters of the
random effects.

Best regards,

Thierry

ir. Thierry Onkelinx
Statisticus / Statistician

Vlaamse Overheid / Government of Flanders
INSTITUUT VOOR NATUUR- EN BOSONDERZOEK / RESEARCH INSTITUTE FOR NATURE AND
FOREST
Team Biometrie & Kwaliteitszorg / Team Biometrics & Quality Assurance
thierry.onkelinx using inbo.be
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Op wo 22 jan. 2020 om 14:55 schreef Souheyla GHEBGHOUB <
souheyla.ghebghoub using gmail.com>:

> Hi,
> In Field (2012) we need 10-15 *participants* per variable for regression,
> in Levshina (2015) we need 10-15 *observations* per variable.
>
> Is it participant or observation? I am so confused as I have 53
> participants and 1484 observations.
>
> Thank you,
> Sou
> PhD in Education
> University of York
>
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