Re: Any mathematical tool to come up with a formula?


"Martin" <trobecgeologygroup@xxxxxxx> schrieb im Newsbeitrag
news:5Zduk.54596$hx.8286@xxxxxxxxxxxx

"inform_won" <won.derick@xxxxxxxxx> wrote in message
news:4419924.1219879883883.JavaMail.jakarta@xxxxxxxxxxxxxxxxxxxxxxxxx
Hello all,

I want to come up with an equation [something like C = f(S)] relating
between the variables involved.

My data:

S--------C
0--------6.4
9--------7.81
100-----10.9
1000----27.9

Any help pls. Any mathematical tool that I can use to derive the
relationship please?

Here's a solution using the Weibull model y = a-b*exp(-c*x^d) (rsqr
0.998)

x y ypred residual
0.00 6.40 6.91 0.51
9.00 7.81 7.21 -0.60
100.00 10.90 11.00 0.10
1000.00 27.90 27.85 -0.05
2000.00 29.42 29.45 0.03


with parameters,
a = 29.536366
b = 22.628971
c = 0.0011792035
d = 1.1143217




See your solution gaphically

http://home.arcor.de/janch/janch/_news/20080905-graphic-martin/


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Jan C. Hoffmann eMail aktuell: janch@xxxxxxxxxxxxxxxxxxx
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