[R-sig-ME] equation for linear mixed model for repeated measures data

Thierry Onkelinx thierry.onkelinx at inbo.be
Mon Oct 10 09:12:08 CEST 2016


Dear Ahmad,

You can find that in books like Pinheiro & Bates (2000) or Zuur et al
(2009).

Best regards,

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

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

2016-10-09 15:56 GMT+02:00 Ahmad <ahmadr215 op tpg.com.au>:

> Hi
>
>
>
> I have used "nlme" package in R for linear mixed model with repeated
> measures using lme function (below):
>
>
>
> model.1 <- lme(hta ~ group + days, data = dat, random = ~ 1 | id)
>
> where is "hta" is the dependent variable, with 3 "groups" measured for 7
> "days", and "id" is the induvial observations (subject) that were repeated
> on for 7 days.
>
>
>
> I am looking for the scientific question of this model for publication
> (e.g.; yij = â0 + â1X1ij ,..) in "nlme" package, but couldn't find it.
>
>
>
> Any help comments would be greatly appreciated!
>
>
>
> Ahmad
>
>
>
>
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>
>
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