Timeline for Why are my fitted coefficients so well-determined? [closed]
Current License: CC BY-SA 4.0
14 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 3, 2019 at 0:26 | vote | accept | Houndbobsaw | ||
| Nov 2, 2019 at 15:43 | history | closed | Peter Flom | Needs details or clarity | |
| Nov 2, 2019 at 15:43 | comment | added | Peter Flom | I agree with @MichaelHardy. What is Y? What is t? Why are you fitting a curve like the one you have? My blog post how to ask a statistics question may help you write this in a way that can be answered. | |
| Nov 2, 2019 at 11:35 | review | Close votes | |||
| Nov 2, 2019 at 15:43 | |||||
| Nov 2, 2019 at 11:13 | comment | added | NotMe | Could you tell us why you think that the confidence intervals of the fit parameters are too small? | |
| Nov 2, 2019 at 11:11 | answer | added | NotMe | timeline score: 1 | |
| Nov 2, 2019 at 10:44 | comment | added | James Phillips | I suggest adding the tag "mathematica" to the question. | |
| Nov 2, 2019 at 5:29 | comment | added | Michael Hardy | I'm reacting to the fact that you're being difficult. You still haven't said anything about any values of $t$, although I've mentioned that several times. | |
| Nov 2, 2019 at 4:55 | comment | added | Michael Hardy | Suppose one has $$ y = a\cos(2\pi t) + b \sin(2\pi t)+c\cos(4\pi t)+d\sin(4\pi t)+e. $$ Then data could consist of observed values of $y$ and of $t,$ and one might be able to estimate the coefficients. But if you say you have observed values of $y,$ but not of $t,$ and you write $$ a\cos(2\pi t)+b\sin(2\pi t) + c\cos(4\pi t)+d\sin(4\pi t)+e $$ with no variable called $y,$ then at best we can guess what you mean, and guessing is what I am doing here. | |
| Nov 2, 2019 at 4:46 | comment | added | Michael Hardy | Your question remains incomprehensible. You say "each with some different value $y$", but then nothing called $\text{“}y\text{''}$ appears in what follows. | |
| Nov 2, 2019 at 4:27 | comment | added | Houndbobsaw | Removed the a's. I just want to say each point has some value. The main point of my question i suppose is how to find the errors in the fitted parameters for a NonlinearModelfit of the said function performed on a dataset? | |
| Nov 2, 2019 at 4:23 | history | edited | Houndbobsaw | CC BY-SA 4.0 |
edited body
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| Nov 2, 2019 at 4:19 | comment | added | Michael Hardy | Your question is absolutely opaque. One might speak of fitting a function $y = a\cos(2\pi t)+b\sin(2\pi t)+c\cos(4\pi t)+d\sin(4\pi t)+e$ where your sample includes some observed values of $y$ and of $t,$, but you speak of $a_i,$ $i=1,\ldots,N$ without saying whether those are in the role of $y$ or of $t.$ Your question as now written cannot be understood. | |
| Nov 2, 2019 at 4:10 | history | asked | Houndbobsaw | CC BY-SA 4.0 |