From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
> Behalf Of array chip
> Sent: Tuesday, November 08, 2011 10:57 AM
> To: Dennis Murphy
> Cc: r-help@r-project.org
> Subject: Re: [R] why NA coefficients
>
> Hi Dennis, Thanks very much for the details. Al
and should not
be used?
Thanks
John
From: Dennis Murphy
Cc: "r-help@r-project.org"
Sent: Tuesday, November 8, 2011 10:22 AM
Subject: Re: [R] why NA coefficients
The cell mean mu_{12} is non-estimable because it has no data in the
cell. How can yo
Because "treat 1_group 2" has no cases, so why it is still estimable while
> on the contrary, "treat 7_group 2" which has 2 cases is not?
> Thanks
> John
>
>
>
>
>
> From: Dennis Murphy
> To: array chip
> Sent: Monday, November
vid.
Thanks
John
From: David Winsemius
To: David Winsemius
Cc: array chip ; "r-help@r-project.org" >
Sent: Monday, November 7, 2011 10:27 PM
Subject: Re: [R] why NA coefficients
But this output suggests there may be alligators in the swamp:
> predict(lmod, newdata=data.
true, why it has to omit "treat 7-group 2"
Thanks again
From: David Winsemius
Cc: "r-help@r-project.org"
Sent: Monday, November 7, 2011 10:19 PM
Subject: Re: [R] why NA coefficients
On Nov 7, 2011, at 10:07 PM, array chip wrote:
Sure it does, but still struggling with what is going on...
Thanks
John
From:David Winsemius
To:David Winsemius
oject.org>
Sent:Monday, November 7, 2011 10:27 PM
Subject:Re: [R] why NA coefficients
But this output suggests there may be alligators in
nday, November 7, 2011 5:13 PM
Subject: Re: [R] why NA coefficients
On Nov 7, 2011, at 7:33 PM, array chip wrote:
> Hi, I am trying to run ANOVA with an interaction term on 2
factors (treat has 7 levels, group has 2 levels). I found the
coefficient for the last interaction term is al
reat 7-group 2" is not estimable?
Well, it had to omit one of them didn't it?
(But I don't know why that level was chosen.)
--
David.
Thanks
John
From: David Winsemius
To: array chip
Cc: "r-help@r-project.org"
Sent: Monday, November 7, 2011 5:13 PM
Subject: Re: [
hich has 2 cases is not?
Thanks
John
From: Dennis Murphy
Sent: Monday, November 7, 2011 9:29 PM
Subject: Re: [R] why NA coefficients
Hi John:
What is the estimate of the cell mean \mu_{12}? Which model effects
involve that cell mean? With this data ar
imable?
Thanks
John
From: David Winsemius
Cc: "r-help@r-project.org"
Sent: Monday, November 7, 2011 5:13 PM
Subject: Re: [R] why NA coefficients
On Nov 7, 2011, at 7:33 PM, array chip wrote:
> Hi, I am trying to run ANOVA with an interaction term on 2 factors
On Nov 7, 2011, at 7:33 PM, array chip wrote:
Hi, I am trying to run ANOVA with an interaction term on 2 factors
(treat has 7 levels, group has 2 levels). I found the coefficient
for the last interaction term is always 0, see attached dataset and
the code below:
test<-read.table("test.t
Hi, I am trying to run ANOVA with an interaction term on 2 factors (treat has 7
levels, group has 2 levels). I found the coefficient for the last interaction
term is always 0, see attached dataset and the code below:
> test<-read.table("test.txt",sep='\t',header=T,row.names=NULL)
> lm(y~factor(t
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