Questions tagged [fitting]
Questions on the use of Mathematica to construct models for approximating empirical data.
1,784 questions
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Can weighted parameter error estimates from MM13 and earlier be replicated using Around in MM14?
Consider some noisy data with varying levels of uncertainty on each data point:
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Numerical minimization of an objective function (revised)
I'm trying to develop some code that I can easily adapt to different material models
(Propagation Models).
I'm revising my previous question to enable everyone to reproduce the problem with some ...
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Numerical minimization of an objective function [closed]
I'm trying to develop some code that I can easily adapt to different material models (see Propagation Models
For that I have defined a "vector"
that enters into the functions that are the ...
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1
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134
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Difference between Mathematica NonlinearModelFit and Excel Solver? [closed]
Sorry if this is a stupid question. I was wondering what the difference is between Mathematica NonlinearModelFit and Excel solver if you set up excel to minimize the sum of squared residuals. I've ...
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NonlinearModelFit finds only "fake" minima
I'm trying to fit the parameters of a function that, since it's the result of many complicated calculations, cannot be expressed analytically, but only calculated.
Let me write it as
...
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Fitting many peaks to dataset
I have the following dataset:
dataset
I am trying to fit this with a series of gaussians, without overfitting. I have tried the following,
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- 71
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Fitting experimental data with a convolution of two functions - how to speed up such calculations?
I am trying to write a program that fits experimental data with a convolution of experimental instrumental response function (IRF) with several Exponential functions. This is what I coded so far.
Here ...
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1
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Find Fit function to my plot
I want to solve this equation and find Z.
But solving this equation is difficult due to the complexity of its functions. So, I used a numerical method and managed to plot Z as a function of changes ...
- 95
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Fitting an experimental data using Nonlinear Model fit having four unknown parameter which need to find out from fitting
I am new to Mathematica. I am trying to find out four unknown parameter
by fitting an experimental data with the formula given below by using Nonlinear Model
Fit.
The two-band model for Hall ...
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113
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FindRoot in FindFit
I have a data named Hc2Tdata where its plot is shown in the first figure. The x-axis is $T$ while the y-axis is $H_{c2}(T)$. I want to fit this with the equation ...
- 787
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Confidence intervals in NonlinearModelFit , extract the numbers
How do I get the confidence intervals from NonlinearModelFit so that I can use them in subsequent calculations?
In this example I generate some data and then use <...
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How can I fit two datasets simultaneously using two different functions but with the same parameters?
There are two sets of data: firstHalf and secondHalf. Both firstHalf and secondHalf are fitted using the models modelPositive and modelNegative, respectively. Both models use the same parameters: MS, ...
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Using FindFit for non linear model fitting how to calculate standard deviation of fitted parameters?
Is FindFit function of Mathematica works faster than NonLinearModelFit ?? I found FindFit works much faster in my model (almost 8 times). Can someone helps me how to calculate the standard deviation ...
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Given six points in P^3 with no four coplanar, how do you compute the unique twisted cubic passing through them
A twisted cubic has parametrization $A\pmatrix{1\\t\\t^2\\t^3}$ for a nonsingular 4×4 matrix $A$
https://en.wikipedia.org/wiki/Twisted_cubic:
Given six points in P3 with no four coplanar, there is a ...
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Is this possible to get symbolic result for this polar integral for these two cases?
This is the integrate.
$$
\int_0^{2\pi}
\!\!\!\int_0^R
\frac{k\,r^{2}\,\bigl(a - r \sin\theta\bigr)}
{\Bigl[r^2 \cos^2 \theta + (\,a - r \sin\theta\,)^2\Bigr]^{3/2}}
...
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