Displaying 2 results from an estimated 2 matches for "christfried".
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