[R] package nlme

[ONKELINX, Thierry]

You did not specify the random effects. Try something like

Rice.lme<-lme(Yield ~ Variety + Stand,data=Rice, random = ~1|Block)

HTH,

Thierry

------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium
tel. + 32 54/436 185
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-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens wenjun zheng
Verzonden: maandag 12 oktober 2009 10:57
Aan: R-help at r-project.org
Onderwerp: [R] package nlme

Hi R Users,     When I use package nlme for linear model with random
effects, there exists errors and I don't know the data structure of lme.
     Here is my data:


Rice<-data.frame(Yield=c(8,7,4,9,7,6,9,8,8,8,7,5,9,9,5,7,7,8,8,8,4,8,6,4
,8,8,9),
                 Variety=rep(rep(c("A1","A2","A3"),each=3),3),
                 Stand=rep(c("B1","B2","B3"),9),
                 Block=rep(1:3,each=9))
    Rice.lme<-lme(Yield ~ Variety + Stand  + Block,data=Rice)

    And error will be like below:

    Wrong at getGroups.data.frame(dataMix, groups) :
    Invalid formula for groups

    can you give me some advice and you will be appreciated. Thanks.

    Wenjun.

	[[alternative HTML version deleted]]

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