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Old 2021-10-06, 19:15   #1
greenskull
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Default Curve fitting, approximation, extra- or inter- polation, volatility, сonfidence interval

Hi, guys,

If you have a data set and you need to investigate it (see Title/Subj), then please don't hesitate to contact me.
Perhaps I can suggest a better solution here.
The quality of the fitting will be even better if you briefly comment on the nature of this dataset.

And I will do it for you with great pleasure :)
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Old 2021-10-06, 19:38   #2
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Go on then. Show them how it is done.
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Old 2021-10-06, 19:46   #3
greenskull
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Quote:
Originally Posted by Batalov View Post
I've already done that :)
https://mersenneforum.org/showthread...071#post583071

If your question is how I guessed that it was such a model, then the shape of the curve reminded me of the rank distribution curve. I investigated these curves some time ago. I just guessed and experimented with a data set and the model a little.

Last fiddled with by greenskull on 2021-10-06 at 20:12
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Old 2021-10-06, 20:04   #4
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Where are the confidence intervals? Where is truth in advertising?

Don't bother answering though. These were rhetorical questions.

I have no further questions to anyone who is not aware of the appropriate precision of presenting the data.
Every time I see 15 digits of precision in slides, in presentation, aw well even in postings, - "I reach for my mental revolver." It shows immediately without any fear of contradiction the Dunning-Kruger effect in action.
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Old 2021-10-06, 20:22   #5
greenskull
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Quote:
Originally Posted by Batalov View Post
Where are the confidence intervals? Where is truth in advertising?

Don't bother answering though. These were rhetorical questions.

I have no further questions to anyone who is not aware of the appropriate precision of presenting the data.
Every time I see 15 digits of precision in slides, in presentation, aw well even in postings, - "I reach for my mental revolver." It shows immediately without any fear of contradiction the Dunning-Kruger effect in action.
I didn't count the confidence interval. The question was not posed that way. The dude asked to advise him the model. He was advised.
And in support of my advise, I showed the correlation coefficients.
You don't need to look at all the numbers, just look at five nines after zero and comma. It is enough.

Last fiddled with by greenskull on 2021-10-06 at 20:26
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Old 2021-10-07, 01:57   #6
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https://www.curveexpert.net/
Been using it for years and there have been many others. You can "roll your own" after a while.
CERN had some interesting publicly available software that I was using in the mid 90's and I believe they still do, but I could be wrong.
Analyzing particle physics data and reporting on the same is a professional grade art.

Last fiddled with by jwaltos on 2021-10-07 at 02:02
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Old 2021-10-07, 08:56   #7
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Yes, it's a useful tool.
But this software does not perform spectral analysis. And it does not allow, for example, to identify harmonic components within the process.
And also it will not be possible to investigate complex Transient response. Much will have to be done manually.

Last fiddled with by greenskull on 2021-10-07 at 09:25
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Old 2021-10-07, 23:19   #8
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Quote:
Originally Posted by greenskull View Post
Quote:
Originally Posted by Batalov View Post
I've already done that :)
https://mersenneforum.org/showthread...071#post583071
I note that this "advice" came four months after the OP had stated
Quote:
Table-lookup param-selection is coded up.
<snip>
Thanks to all for playing!
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Old 2021-10-07, 23:49   #9
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Quote:
Originally Posted by Dr Sardonicus View Post
I note that this "advice" came four months after the OP had stated
Alas, yes.
I really enjoy solving these problems. Therefore, I brought it out as a separate post here.
Maybe I can help someone and will do it in time.
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