Binary variables used with lme model
Hi Igor, If your response is binary, you must treat it as binary. Lme only works with continuous data. Use glmer() from the lme4 package instead. HTH, Thierry ------------------------------------------------------------------------ ---- ir. Thierry Onkelinx Instituut voor natuur- en bosonderzoek team Biometrie & Kwaliteitszorg Gaverstraat 4 9500 Geraardsbergen Belgium Research Institute for Nature and Forest team Biometrics & 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-sig-mixed-models-bounces at r-project.org
[mailto:r-sig-mixed-models-bounces at r-project.org] Namens Igor Blanco
Verzonden: woensdag 21 juli 2010 18:23
Aan: r-sig-mixed-models at r-project.org
Onderwerp: [R-sig-ME] Binary variables used with lme model
Hi there,
I am trying to analyze some data using the lme package.
My data contains continuous variables but there is one
specific variable called Newmarker that can only take 2
values (number 1 or number 2).
I am interested in using this as a "flag" when I apply a lme
model I have used the as.factor trying to remark this fact
but an error message appears stating: attempt to set rownames
on object with no dimensions.
Here is the code I have used:
*Dataset <- read.table("Data2.txt", header=TRUE, sep="",
na.strings="NA",
dec=".", strip.white=TRUE)
Dataset$Newmarker <- as.factor(Dataset$Newmarker)
lme.1 <- lme(Newmarker ~ Age, data=Dataset, random= ~1|ID)
summary(lme.1)*
If I don't use the as.factor I have no problems but the
results don't reflect the fact of my "binary" variable Newmarker..
Can anybody help me please?
Thanking you in advance,
Much appreciated,
Igor Blanco
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