>> can you explain that a little more detailed?
>> Perhaps I miss the background knowledge - but it seems just absurd
to me.
>>
>> 0.1+0.1+0.1 is 0.3 - there is no rounding involved, is there?
>>
>> why is
>> x <- 0.1 + 0.1 +0.1
>> not equal to
>> y <- 0.3
>
> Remember that this is in BINARY a
When a variance components mixed model is run in Stata, if some of the
variance components are zero, the model may not converge, for rational
reasons. However, when the same model is run in SAS, the models with
variance components that estimate to zero nonetheless converge. If I'm
intereste
.
I also have an issue on the Mac getting latex(describe(iris)) to work.
I get the .tex file but this error:
> latex(describe(iris))
This is pdfTeXk, Version 3.141592-1.40.3 (Web2C 7.5.6)
%&-line parsing enabled.
entering extended mode
(/var/folders/AJ/AJjttUSSFdSi1HiInJZyYTI/-Tmp-//Rtm
.
Just goes to show that Frank Harrell beats Google for statistics any
day of the week!
I have got to try that PO model!!
On Jan 23, 2008, at 4:45 PM, Frank E Harrell Jr wrote:
> David Airey wrote:
>> While I defer to Frank as far as expertise goes, not having access
>> t
l Jr wrote:
> David Airey wrote:
>>> We need a two-way non-parametric ANOVA in order to analysis
>>> properly some ecological data, do you know any reference in R? or
>>> how to do it? Thank you very much All the best diana
>>>
>> A coup
:)
I was curious what you would say!
Frank was kind enough to send this off list, but it's worth posting to
the thread.
On Jan 23, 2008, at 10:52 AM, Frank E Harrell Jr wrote:
> David Airey wrote:
>>> We need a two-way non-parametric ANOVA in order to analysis
>>>
> We need a two-way non-parametric ANOVA in order to analysis properly
> some ecological data, do you know any reference in R? or how to do
> it? Thank you very much All the best diana
>
A couple more references here are below. I liked the Scheirer reference.
/*
Scheirer CJ, Ray WS, Hare N (1
.
Just to close the query, here are the data and my R code to use nlme
to test for a strain difference in receptor binding using nlme and the
self start function SSmicmen.
Cheers,
Dave
"rownames","y","x","strain","pool"
"1",1,54.0423393249512,0.169009417295456,"dba","5_10"
"2",2,96.19451904
> Dear list,
>
> Has anyone created a version of SSmicmen that allows testing for
> group differences? The basic Michaelis-Menten equation is:
>
> (Bmax * X) / (Kd + X).
>
> The nlme package allows modeling of random effects for Bmax and Kd
> as needed, but I curious how I can build in group di
Dear list,
Has anyone created a version of SSmicmen that allows testing for group
differences? The basic Michaelis-Menten equation is:
(Bmax * X) / (Kd + X).
The nlme package allows modeling of random effects for Bmax and Kd as
needed, but I curious how I can build in group differences? I ha
.
I would love more quality online documentation around the same level
as at UCLA (http://www.ats.ucla.edu/stat/; the Stata pages are
fantastic), but I think I would like the first draft responsibility
to fall to the well qualified instructor (Hi Matt!), and those with
at least a Masters i
To estimate saturation binding parameters Bmax and Kd in a receptor
saturation binding experiment, I use the following nonlinear equation
and the nls() function:
bmax*X*dummy
+ ns*X + background = total binding
kd+X
where X is concentration, and dummy is an indicator to allow sh
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