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Questions tagged [non-linear-regression]

In statistics, nonlinear regression is a form of regression analysis in which observations are modeled by a function which is a nonlinear combination of the model parameters and depends on one or more independent variables.

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calculate gaussian curve fitting on a list

I have a list data like below. I want to perform nonlinear regression Gaussian curve fitting between mids and counts for each element of my list and report mean and standard deviation mylist<- structure(list(A = structure(list(breaks = c(-10, -9,…
nik
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regression with high polynomial interaction in r (large data)

I am working on a project using R to select a best fitted model. I have 15 variables and the sample size is 790,000. Linear model does not work b/c the residuals are not random and non-normal. So I tried to run nonlinear model with higher…
Shiring
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Fitting exponential nls in R

I am trying to fit a line of best fit to some data. From the look of it it's a negative exponential curve. I have managed to use the nls function to find a second order polynomial fit, but when I try to fit an exponential problems occur.... When I…
George
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Accessing defined parameters in a formula in R

I am writing a function that allows many starting parameter combinations to be tried to fit nonlinear regression as nlsList() only allows one set of starting parameters. I have managed this fine but want to add a predictions data frame into the…
Daniel Padfield
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Syntax for graphing 3-way curvilinear multiple regression interaction in SPSS?

I'm attempting to complete my dissertation, but given I'm not a programmer, I'm running into trouble figuring out how to write SPSS syntax to graph my results. I have three continuous predictors and one continuous dependent variable; I need to graph…
Marisa
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Custom nonlinear function in `R.gnm`

I'm trying to build a nonlinear model as described in the manual for gmn in R. The desired form of the model is y = b0*x0^g0 + b1*x1^g1 + ... This would seem to be the simplest possible form of nonlinear model to me, but for some reason (and…
Sideshow Bob
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Scikit - Format Output of Polynomial Regression

I doing polynomial regression with scikit learn and try to interpret the coefficients. But somehow scikit doesn't format the output. So it looks like this: [ 0.,0.95545289,0.,0.20682341,-0.,0.,-0.,-0.,0.,0.,0.,-0.,0.,-0.,-0.,] How can I map the…
Alanovic
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Only getting a single value from predict.nls - why?

I'm running the folllowing to get predicted/fitted values: library(RCurl) data <- getURL("https://gist.githubusercontent.com/aronlindberg/a8a6644a639c35ceb9d9/raw/5b7c13bbcd439dacbca70e07c96b6c33804273d2/data.csv") object <- read.csv(text =…
histelheim
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R - NLS and linear equation

I know NLS is used to fit nonlinear equations, but I don't understand why it won't work with a simple linear one. I mean, the theory should still hold, right? But, when I try to do something simple like the following, it won't converge. y =…
kyro1021
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Python : Gaussian Process Regression and GridSearchCV

I am working on Gaussian Process Regression with Python on NIR spectrum data. I can get some results with GPR and would like to optimize parameters for GPR. I am trying to use GridSearchCV to optimize parameters, but I keep getting an error and…
Jay
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GSL non-linear least squares fit won't converge

I am relatively new to C++ and especially the GSL. Nonetheless I have undertaken the endeavour to solve the problem of fitting non-linear functions to some data with the implementations provided by GSL. The idea is to have a Class (Clnm), which…
DrEigelb
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How to code remove NA in "with" base in R

My simple data set look like the following. +--------+------+--------+-----+-----+ | Time | Firm | Out | Lab | Cap | +--------+------+--------+-----+-----+ | Jan-00 | A | 161521 | 261 | 13 | | Feb-00 | A | 142452 | 334 | 15 | | Mar-00…
Doo
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Biexponential Model in R

I have a question: In R for Biexponential Model can I use a data that contains negatives ??? Because it gives me ERROR !!! Is it possible that the negative numbers be the reason for that Errors ? My function for Biexponential in R…
User 9963571
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nlinfit Dimension Error

I am using nonlinearfit tool in matlab. I keep getting the following error: Error using nlinfit (line 210) MODELFUN must be a function that returns a vector of fitted values the same size as Y (1-by-100). The model function you provided returned…
swagat patnaik
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Determine Uncertainty in Peak Value of Spectrum (Standard Error or Parameter Error)

I want to extract the position of a peak from a spectrum (energy spectrum of scattered photons). To do so, I am using scipy.optimize.curve_fit to fit a Gaussian to the region of the spectrum that resembles the Gaussian. How do I find the uncertainty…
user200017
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