gt; > I couldn't find a discussion of POSIXct/POSIXlt objects in the R
> > manuals (unless I missed it somewhere), so perhaps "An Introduction to
> > R" could be updated to include this subject, and then the help files
> > could reference that?
> >
> &g
Hi All: I've been following this thread and just want to add one pointer.
For those who aren't interested in using new packages that try to make
dates-times easier but also find the
base R tools confusing, below is link to an extremely well written document
from over 15 years ago. It's probably
al
ing “small” gradient and “positive definite”
> Hessian, since these can depend upon the scale of the objective function
> and the parameters.
>
>
>
> Ravi
>
>
>
> *From:* Mark Leeds [mailto:marklee...@gmail.com]
> *Sent:* Friday, July 21, 2017 3:09 PM
> *To:
el-boun...@r-project.org] On Behalf Of
> Therneau, Terry M., Ph.D.
> Sent: Friday, July 21, 2017 8:04 AM
> To: r-devel@r-project.org; Mark Leeds ;
> jorism...@gmail.com; westra.harm...@outlook.com
> Subject: Re: [Rd] Wrongly converging glm()
>
> I'm chiming in late sin
Hi Harm-Jan. I've been following this thread to some degree and just want
to add that
this issue is not specific to the GLM. It's a problem with optimization of
functions in general. I was using use Rvmmin with constraints which is an
extremely solid optimization package written by John Nash ( use
to encounter convergence
> problems. I should probably switch to optimx using all the methods that
> offers for constrained optimization, including nminb.
>
>
> Best Wishes,
> Spencer Graves
>
>
>
> On 10/8/2016 5:00 PM, Mark Leeds wrote:
>
> Hi Spencer
Hi Spencer: See the link below about L-BFGS-B below because I had problems
with it a good while back (and I think the link description is the cause
but I can't prove it ) so eventually I moved to the Rvmmin(b) package.
It's a package but really an algorithm. Rvmmin(b) uses a variable-metric
alg
ld
be installed from cran.
On Fri, Feb 22, 2013 at 10:07 PM, Mark Leeds wrote:
> Hi David: According to the description on cran, lattice imports grid.
>
> I don't know if you've seen it but www.obeautifulcode.com has a very nice
> topic in its archives called "How R Se
Hi David: According to the description on cran, lattice imports grid.
I don't know if you've seen it but www.obeautifulcode.com has a very nice
topic in its archives called "How R Searches and Finds Stuff" which is
relatde to your question that I found it to be really helpful. A lot of
people on
Hi Ravi: As far as I know ( well , really read ) and Bert et al can say
more , the AIC is not dependent on the models being nested as long as the
sample sizes used are the same when comparing. In some cases, say comparing
MA(2), AR(1), you have to be careful with sample size usage but there is no
n
Hi Duncan: Luke's article is in the June, 2003 edition of R-news
On Mon, Nov 15, 2010 at 8:43 PM, Duncan Murdoch wrote:
> Hadley Wickham wrote:
>
>> Hi all,
>>
>> I'm trying to understand how the search path and namespaces interact.
>> For example, take the devtools package which suggests the te
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