o:pda...@gmail.com]
Sent: Thursday, July 08, 2010 4:09 AM
To: Bond, Stephen
Cc: r-help@r-project.org
Subject: Re: [R] forcing a zero level in contr.sum
Bond, Stephen wrote:
> I need to use contr.sum and observe that some levels are not
> statistically different from the overall mean of zero.
Bond, Stephen wrote:
> I need to use contr.sum and observe that some levels are not
> statistically different from the overall mean of zero. What is the
> proper way of forcing the zero estimate? It seems the column
> corresponding to that level should become a column of zeros. Is there
> a way to
On Wed, Jul 7, 2010 at 10:55 PM, Charles C. Berry wrote:
>
>
> contr.mysum <- function (n, contrasts = TRUE, sparse = FALSE,
> base=length(levels))
> {
The memisc package has a contr.sum function with a base= argument.
__
R-help@r-project.org mailing l
G'day Stephen,
On Wed, 7 Jul 2010 16:41:18 -0400
"Bond, Stephen" wrote:
> Please, do not post if you do not know the answer. People will see
> this has answers and skip.
>
> I tried with
> mat1=contrasts(fixw$snconv)
> mat1=mat1[,-2]
> summary(frm2sum <- glm(resp.frm ~
> C(snconv,contr=mat1)+m
this will only work if a) the GM=0 and b) there is only one term on
the RHS of the model, and c) probably a bunch of other restrictions.)
--
David.
>
> Thank you.
>
> Stephen Bond
> -Original Message-
> From: David Winsemius [mailto:dwinsem...@comcast.net]
> Sent:
et]
Sent: Wednesday, July 07, 2010 4:15 PM
To: Bond, Stephen
Cc: r-help@r-project.org
Subject: Re: [R] forcing a zero level in contr.sum
On Jul 7, 2010, at 4:04 PM, Bond, Stephen wrote:
Clarifying my question:
options(contrasts = c("contr.sum", "contr.poly"))
contrasts()
s still there. Unbelievable.
Stephen Bond
-Original Message-
From: David Winsemius [mailto:dwinsem...@comcast.net]
Sent: Wednesday, July 07, 2010 4:15 PM
To: Bond, Stephen
Cc: r-help@r-project.org
Subject: Re: [R] forcing a zero level in contr.sum
On Jul 7, 2010, at 4:04 PM, Bond,
ilto:dwinsem...@comcast.net]
Sent: Wednesday, July 07, 2010 3:44 PM
To: Bond, Stephen
Cc: r-help@r-project.org
Subject: Re: [R] forcing a zero level in contr.sum
On Jul 7, 2010, at 3:13 PM, Bond, Stephen wrote:
I need to use contr.sum and observe that some levels are not
statistically different from the
-1 -1 -1 -1
I need to force the coefficient on level 03 to be zero.
Thank you.
Stephen Bond
-Original Message-
From: David Winsemius [mailto:dwinsem...@comcast.net]
Sent: Wednesday, July 07, 2010 3:44 PM
To: Bond, Stephen
Cc: r-help@r-project.org
Subject: Re: [R] forcing a
On Jul 7, 2010, at 3:13 PM, Bond, Stephen wrote:
I need to use contr.sum and observe that some levels are not
statistically different from the overall mean of zero.
What is the proper way of forcing the zero estimate? It seems the
column corresponding to that level should become a column of
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