Displaying 4 results from an estimated 4 matches for "ratkowski".
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rutkowski
2005 Apr 04
1
custom loss function + nonlinear models
Hi all;
I'm trying to fit a reparameterization of the
assymptotic regression model as that shown in
Ratkowsky (1990) page 96.
Y~y1+(((y2-y1)*(1-((y2-y3)/(y3-y1))^(2*(X-x1)/(x2-x1))))/(1-((y2-y3)/(y3-y1))^2))
where y1,y2,y3 are expected-values for X=x1, X=x2, and
X=average(x1,x2), respectively.
I tried first with Statistica v7 by LS and
Gauss-Newton algorithm without success (no
2010 Mar 05
0
R algorithm for maximum curvatures measures of nonlinear models
Hi all,
I'm looking for the algorithm to calculate maximum intrinsic and parameter effects curvature of Bates & Watts (1980). I have Bates & Watts (1980) original article, Bates et al (1983) article, Seber & Wild (1989) and Ratkowsky (1983) books. Those sources show steps and algorithm to get this measures but I don't know translate C code to R language and I've no success
2012 Aug 12
0
Index Values in NbClust
Dear All,i applied "NbClust", to my data to find optimum number of clusters, and got following resultsNow, i don't know how to read these results. more precisely, i would like to know, how to see which method is more precise for my data considering these index values.your help is needed...thanks in advance
Eliza Botto
> dput(Eliza)structure(list(All.index = structure(c(2, 3, 4, 5,
2017 Jan 16
4
Error K-MEDIAS, paquete NbClust windows 10, 64 bits
Buenos dias, desde hace algunos dias estoy realizando un trabajo,mi computadora es una DELL, windows 10 64 bits, 8G de RAM y disco de estado solido, estoy procesando 29000 filas y 23 columnas, mi codigo es este:
nb <- NbClust(datos.scaled, distance = "euclidean", min.nc = 2,
#max.nc = 10, method = "complete", index ="all")
.
y mi error es este:
Error: