Displaying 3 results from an estimated 3 matches for "nlpe".
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nlme
2009 Feb 15
1
sources of code; was Generate random numbers in Fortran
...this month. They are the Pascal library on
Netlib. I have some Fortran codes I could post, and BASIC versions too. In
fact, the function minimisation codes that are actually more advanced than
the routines Brian Ripley used in optim() have already been made freely
available (http://www.nashinfo.com/nlpe.htm). The codes still run right
away in DOSBOX along with GWBASIC.EXE, but I believe the more useful
aspect is providing methods and ideas.
Gnu Scientific Library has been mentioned. It has some strengths but a
number of "holes". There are some other notable collections.
The Decision Tr...
2011 Nov 18
0
how to define the bound between parameters in nls() (Jinsong Zhao)
.... The problem is discussed in the book I published with Mary
Walker-Smith in 1987, but I think our treatment is still only an expedient. Note that the
software was in BASIC, but it still runs (DOSBOX is a friend for Linux users). That book
can be obtained free from http://macnash.telfer.uottawa.ca/nlpe/.
Best, JN
On 11/18/2011 06:00 AM, r-help-request at r-project.org wrote:
> Message: 4
> Date: Thu, 17 Nov 2011 20:42:12 +0800
> From: Jinsong Zhao <jszhao at yeah.net>
> To: "r-help at r-project.org" <r-help at r-project.org>
> Subject: [R] how to define th...
2013 Feb 19
3
R nls results different from those of Excel ??
Hi all
I have a set of data whose scatter plot shows a very nice power
relationship. My problem is when I fit a Power Trend Line in an Excel
spreadsheet, I get the model y= 44.23x^2.06 with an R square value of 0.72.
Now, if I input the same data into R and use
model< -nls(y~ a*x^b , trace=TRUE, data= my_data, start = c(a=40, b=2)) I
get a solution with a = 246.29 and b = 1.51. I have tried