Displaying 5 results from an estimated 5 matches for "jennrich".
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heinrich
2001 Apr 09
1
Support for compartment models / matrix exponential method
I try to fit reaction kinetic data to a given hypothetical model
consisting of 3 ODEs. After some reading in Bates/Watts and the literature
cited there (e.g. Jennrich/Bright) I looked in R for functions that support
the use of the matrix exponential method. Until now I used for a similar
(but simpler) problem the nls package and fitted against the the parameterized
solution function. But this works only for simple kinetics.
The algorithms in the nls package (e....
2007 Aug 04
7
Optimization in R
...optim clausen gsl
--------------------------------------------------------------
bard !
beale
brown-scaled
freudenstein-roth
gaussian *
helical-valley * *
jennrich-sampson *
meyer *
powell-scaled *
rosenbrock *
The table indiciates that all three implementations of BFGS failed to compute
the right answer in most case...
2005 Apr 27
0
GPArotation package
We have just put a package GPArotation on CRAN. The functions in this
package perform an number of different orthogonal and oblique rotations
for factor analysis, using the gradient projection algorithm described
in Coen A. Bernaards and Robert I. Jennrich (2005), "Gradient
Projection Algorithms and Software for Arbitrary Rotation Criteria in
Factor Analysis, ", Educational and Psychological Measurement (in
press). Additional details are available on the web site
<http://www.stat.ucla.edu/research/gpa>.
The following rotation...
2008 Jan 14
1
[Off Topic] searching for a quote
Dear community,
I'm trying to track down a quote, but can't recall the source or the
exact structure - not very helpful, I know - something along the lines
that:
80% of [applied] statistics is linear regression ...
?
Does this ring a bell for anyone?
Thanks,
Andrew
--
Andrew Robinson
Department of Mathematics and Statistics Tel: +61-3-8344-9763
University of
2005 Apr 27
0
GPArotation package
We have just put a package GPArotation on CRAN. The functions in this
package perform an number of different orthogonal and oblique rotations
for factor analysis, using the gradient projection algorithm described
in Coen A. Bernaards and Robert I. Jennrich (2005), "Gradient
Projection Algorithms and Software for Arbitrary Rotation Criteria in
Factor Analysis, ", Educational and Psychological Measurement (in
press). Additional details are available on the web site
<http://www.stat.ucla.edu/research/gpa>.
The following rotation...