Dear James,
I don't think that it is possible with lme4. But it is a Bradley Terry model, so:
library(sos)
findFn("bradley terry")
Best regards,
Thierry
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest
team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
Kliniekstraat 25
1070 Anderlecht
Belgium
+ 32 2 525 02 51
+ 32 54 43 61 85
Thierry.Onkelinx at inbo.be
www.inbo.be
To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of.
~ Sir Ronald Aylmer Fisher
The plural of anecdote is not data.
~ Roger Brinner
The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data.
~ John Tukey
-----Oorspronkelijk bericht-----
Van: r-sig-mixed-models-bounces at r-project.org [mailto:r-sig-mixed-models-bounces at r-project.org] Namens James Hughes
Verzonden: woensdag 2 mei 2012 1:24
Aan: r-sig-mixed-models at r-project.org
Onderwerp: [R-sig-ME] Specification of design matrix for random effects (Z)
Hello
I would like to specify the following model using lmer:
Y_ij ~ Binomial(N,p_ij)
p_ij = u + b_i + b_j
where b ~ N(0,s^2).
For example, for the 5 observations (Y_12, Y_13, Y_23, Y_14, Y_24) the random effect vector would be b = (b_1, b_2, b_3, b_4) and the design matrix for the random effects (Z) would be
Z <- matrix(c(1,1,0,0, 1,0,1,0, 0,1,1,0, 1,0,0,1, 0,1,0,1),5,4,byrow=T)
Can such a model be specified in lmer? Thanks for your thoughts.
Jim
_______________________________________________
R-sig-mixed-models at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-sig-mixed-models
* * * * * * * * * * * * * D I S C L A I M E R * * * * * * * * * * * * *
Dit bericht en eventuele bijlagen geven enkel de visie van de schrijver weer en binden het INBO onder geen enkel beding, zolang dit bericht niet bevestigd is door een geldig ondertekend document.
The views expressed in this message and any annex are purely those of the writer and may not be regarded as stating an official position of INBO, as long as the message is not confirmed by a duly signed document.