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Problem with nonlinear regression

#11
No problem, really appreciate the help!

Found some literature that had the same typ of goal. The common thing between them was that they all used second order polynom. Also, it shows if there is any connections between them.

As you said, it's really noise but we just need some kind of "equation" that we later on can use in a mathematical model to represent the O. Even though it's not reliable.

One thing that seems to clear all the errors from minitab and finding a solution is when we add some numbers to V4 and V5 but I cant really understand why.

To be honest, we just need something to show and say "this is the equation but the data is has a lot of downsides". We got about 900 rows of data so hopefully it's not as bad. Any recommendations what to do?
 
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#12
I forgot to mention that V1 to V5 are proportional and equals 100. The reason for using V6 and V7 is to have something that could explain why the previous variables differs when having two rows (from V1 to V5) that has the same values but different result (O).
 

Steve Prevette

Deming Disciple
Staff member
Super Moderator
#13
If the data are stable (which by eyeball they appear to be), the best bet is to put into the model a random number generator with the appropriate Cumulative Distribution Function (or just simulate with the Normal) and run it as a Monte Carlo analysis.
 
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