search for: ratkowsky

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 convergence: predictors...

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 until now. I know and I use rms.curv() in MASS package but I would like the maximum curvatures measures. Does someone have this implemented in R? O...

....Marriot", "index.TrCovW", "index.TraceW", "index.Friedman", "index.Rubin", "index.Cindex", "index.DB", "index.Silhouette", "index.Duda", "index.Pseudot2", "index.Beale", "index.Ratkowsky", "index.Ball", "index.ptbiserial", "index.Frey", "index.McClain", "index.Dunn", "index.Hubert", "index.SDindex", "index.Dindex", "index.SDbw"))), All.CriticalValues = structure(c(2, 3, 4, 5, 6, 7...

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: