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shiuyeung.hui
Denmark
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 Posted - 03/08/2007 : 05:12:29 AM
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Origin Version (Select Help-->About Origin): 7.5
Operating System: XP
Hi
I am trying to perform a Hill fit on the data below, while constraint the curve to:
i. fit through (0,6.86E-10) at the beginning,
and
ii. fit through (1,0) at the end (minimum value of B(Y) is 0, basically)
The data:
A(X) B(Y)
0 6.86E-10
3E-8 5.92E-10
3E-7 4.19E-10
3E-6 9.46E-11
3E-5 2.86E-11
1 0
Would love to hear your suggestions, I am just starting with this program.
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larry_lan
China
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Posted - 03/09/2007 : 05:41:30 AM
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HI:
Since it is not able to use linear constraint for Hill function, I think you can't fit through (0,6.86E-10) and (1,0).
Personally speaking, do you think Hill function is a good model for your data? The X value change too much from 3E-5 to 1. I think you can transform X to log(X) and fit by Dose Response function.
Larry
OriginLab Technical Services |
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Setting Constraints in NLSF Hill Fit