Hi there,

I am trying to analyze some data using the lme package.
In my case there is a variable called Newmarker that can only take 2 values
(number 1 or number 2).
I have used the as.factor 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)

attach(Dataset)

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 I don't think this is
the correct way to proceed... The other variables I use can have any value.

Can anybody help me please?

Thanking you in advance,

Regards,

Igor Blanco

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