Bolker
> Sent: Tue 11/11/2008 3:09 PM
> To: [EMAIL PROTECTED]
> Cc: r-help@r-project.org
> Subject: Re: [R] standard errors for predict.nls?
>
>
> Here's how far I've gotten. It's a start, but
> I can't so far find a way to extract the actual
> t
nd t(qq) gives us the values
obviously quantile can be used with any set of p's
[EMAIL PROTECTED]
-Original Message-
From: [EMAIL PROTECTED] on behalf of Ben Bolker
Sent: Tue 11/11/2008 3:09 PM
To: [EMAIL PROTECTED]
Cc: r-help@r-project.org
Subject: Re: [R] standard errors for predict.nls
Here's how far I've gotten. It's a start, but
I can't so far find a way to extract the actual
thing we want -- the bootstrap confidence intervals
on the predictions.
I apologize for not taking the time to go
read up on the boot library etc. etc. (I *have*
RTFM, but I haven't backtracked to th
On 7/11/2008, at 11:33 PM, Christoph Scherber wrote:
Dear all,
I would like to get standard errors (or confidence intervals) for
*predicted* values from an nls fit.
I have tried to implement code from p.225 in MASS (bootstrapping a
nls fit), but this gives only the
confidence intervals o
Dear all,
I would like to get standard errors (or confidence intervals) for *predicted*
values from an nls fit.
I have tried to implement code from p.225 in MASS (bootstrapping a nls fit), but this gives only the
confidence intervals of the parameter estimates, but not an overall confidence in
Dear Prof Ripley,
Am I correct if I use the following code to get c.i.´s for predicted values of
the nls fit:
puro1<-nls(rate~a*conc/(b+conc), data=Puromycin[1:12,], start=list(a=200, b=1))
#set up nls model
# assume only one predicted value is obtained using
predict(puro1,list(conc=0.02)):
On Mon, 3 Nov 2008, Ben Bolker wrote:
Prof Brian Ripley wrote:
Christoph Scherber agr.uni-goettingen.de>
writes:
Dear all,
Is there a way to retrieve standard errors from nls models?
The help page tells me that arguments
such as se.fit are ignored...
Many thanks and best wishes
Christoph
Prof Brian Ripley wrote:
>> Christoph Scherber agr.uni-goettingen.de>
>> writes:
>>
>>>
>>> Dear all,
>>>
>>> Is there a way to retrieve standard errors from nls models?
>>> The help page tells me that arguments
>>> such as se.fit are ignored...
>>>
>>> Many thanks and best wishes
>>> Christoph
>
On Mon, 3 Nov 2008, Ben Bolker wrote:
Christoph Scherber agr.uni-goettingen.de> writes:
Dear all,
Is there a way to retrieve standard errors from nls models?
The help page tells me that arguments
such as se.fit are ignored...
Many thanks and best wishes
Christoph
I have written some rea
Dear Christoph,
using the package 'alr3' it's not difficult!
Have a look at the following example:
## Fitting a Michaelis-Menten model
Puromycin.m1<-nls(rate~a*conc/(b+conc), data=Puromycin[1:12,],
start=list(a=200, b=1))
library(alr3)
## Predictions (with standard errors) at concentrations 0
Christoph Scherber agr.uni-goettingen.de> writes:
>
> Dear all,
>
> Is there a way to retrieve standard errors from nls models?
> The help page tells me that arguments
> such as se.fit are ignored...
>
> Many thanks and best wishes
> Christoph
I have written some reasonably generic
delta-
Dear all,
Is there a way to retrieve standard errors from nls models? The help page tells me that arguments
such as se.fit are ignored...
Many thanks and best wishes
Christoph
--
Dr. rer.nat. Christoph Scherber
University of Goettingen
DNPW, Agroecology
Waldweg 26
D-37073 Goettingen
Germa
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