Timeline for How to improve nonlinear fitting
Current License: CC BY-SA 4.0
14 events
| when toggle format | what | by | license | comment | |
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| 3 hours ago | comment | added | JimB | Half of the observations are duplicates: the 0 degree value is exactly the same as the 360 degree value, the 10 degree value is exactly the same as the 350 degree value, and so on. You don't describe how the data was obtained or anything about the subject matter which matters when making decisions about fitting. | |
| 3 hours ago | history | edited | MMA13 | CC BY-SA 4.0 |
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| 3 hours ago | comment | added | MMA13 | @azerbajdzan, you are right $a A$ is naive to use. I will modify the question | |
| 3 hours ago | comment | added | MMA13 | I have a data for an observable that is a function of \theta and \phi in sphirical coordinate. I am trying to find a single model that can fit all data. Sorry, what do you mean by " only have half of the observations presented"? | |
| 6 hours ago | comment | added | JimB |
NonlinearModelFit (and LinearModelFit) is not the problem. You need a better model (as shown in the current two answers). Is there some physical model that is indicated? If not, a better fit is just a better description of the data rather than an explanation of the data. Also, you really only have half of the observations presented which means that any standard errors are underestimated. The fitting should just use the real data and not any of the duplicated data.
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| 7 hours ago | history | became hot network question | |||
| 14 hours ago | answer | added | azerbajdzan | timeline score: 5 | |
| 14 hours ago | answer | added | ydd | timeline score: 4 | |
| 15 hours ago | comment | added | azerbajdzan |
Using two parameters a A has no sense.
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| 15 hours ago | answer | added | yarchik | timeline score: 7 | |
| 15 hours ago | comment | added | MMA13 | Sorry, dat modified. | |
| 15 hours ago | history | edited | MMA13 | CC BY-SA 4.0 |
added 50 characters in body
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| 15 hours ago | comment | added | yarchik |
Your data point {190, 0} does not correspond to your dat graph.
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| 15 hours ago | history | asked | MMA13 | CC BY-SA 4.0 |