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 Best fit : column combination		  New Topic  Reply to Topic
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jmb22

USA
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Posted - 08/09/2006 :  10:52:08 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7.0
Operating System: WinXP

Hi,

I have a datasheet with 5 columns
A(X) B(Y) C(Y) D(Y) E(Y)

I want to find the best parameters b, c, d to fit E with a combination of B, C, D as follows;

E = b*B + c*C + d*D

(b, c and d are constants)

Thanx

Mike Buess

USA
3037 Posts
Posted - 08/09/2006 :  12:11:21 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
1. Enter Ctrl + Y to open the Advanced Fitting Tool.
2. Click the More button if you see it.
3. Select Function > New and set up the function as shown below. (The 0*x term is necessary to compile the function.)



4. Change the function name (if you like) and Save.
5. Select Action > Dataset and set up the datasets similar to this...



6. Select Action > Fit to show the fitting tab below.



7. Initialize the fitting parameters b,c and d by entering best guesses. (b=c=d=1 will probably work.) Then click the 100 Iter button to perform the fit. Repeat once or twice for convergence.

Mike Buess
Origin WebRing Member
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