search for: christfri

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2005 Apr 08
1
kunamorph@web.de
...quot;aggregate()" or "by()"? The data are like this: x y group 1 4 B 2 4 B 3 5 C I would like obtain the correlation between x and y for each subset. I don't want to use the workaround with the function subset(), because I have many groups. Thanks in advance. Christfried Kunath KC
2005 Jun 21
2
nls(): Levenberg-Marquardt, Gauss-Newton, plinear - PI curve fitting
Hello, i have a problem with the function nls(). This are my data in "k": V1 V2 [1,] 0 0.367 [2,] 85 0.296 [3,] 122 0.260 [4,] 192 0.244 [5,] 275 0.175 [6,] 421 0.140 [7,] 603 0.093 [8,] 831 0.068 [9,] 1140 0.043 With the nls()-function i want to fit following formula whereas a,b, and c are variables: y~1/(a*x^2+b*x+c) With the standardalgorithm