Respondida
Constrained Polynomial Regression
The 12a release of Statistics Toolbox has some very nice new features for regression analysis. There is a new function named Li...

alrededor de 12 años hace | 0

Respondida
Constrained Polynomial Regression
Curve Fitting Toolbox allows you to specify constraints for individual regression coefficients. With this said and done, coul...

alrededor de 12 años hace | 1

Respondida
fitting curve to two points
Here's the rub... When you fit a second order Fourier series, you're estimating values for six different regression coefficie...

alrededor de 12 años hace | 0

| aceptada

Respondida
fitting curve to two points
From the looks of things, your daily load curve is a particular example of a second order Fourier series. If you have Curve F...

alrededor de 12 años hace | 0

Respondida
Principal Component Analysis
The Statistics Toolbox product page has a good demo titled "Partial Least Squares Regression and Principal Components Regression...

alrededor de 12 años hace | 0

Respondida
nonlinear curve-fitting: weight vector
nlinfit in Statistics Toolbox # Uses Levenberg-Marquardt under the hood # Allows you to input a vector of weights See <ht...

alrededor de 12 años hace | 0

| aceptada

Respondida
data management for large datasets
Have you looked into the dataset array that ships with Statistics Toolbox? The dataset array is a special data type that can ...

alrededor de 12 años hace | 1

| aceptada

Respondida
Regression
Try the following X = linspace(1, 2*pi, 50); X = X'; Y = sin(X) + randn(50,1); foo = fit(X,Y, 'sin1'); ...

alrededor de 12 años hace | 1

Respondida
Multiple Regression under constraints
Lets start with the regression side of the problem: Given that you want to place constraints on your coefficients, you're goi...

alrededor de 12 años hace | 1

Respondida
Robust orthogonal or total least squares linear regression
Unfortunately, Statistics Toolbox doesn't currently offer a robust version of PCA. Your best option would probably be to us...

alrededor de 12 años hace | 0

Respondida
Histogram then a curve fitting to compare with normal
You might want to consult the following example: http://www.mathworks.com/products/statistics/demos.html?file=/products/demos...

alrededor de 12 años hace | 0

Respondida
Curve fitting - periodic function
Here's a pretty basic example X = linspace(0, 2*pi, 100); X = X'; Y = sin(X) + randn(100,1); foo = fit(X,Y, 's...

alrededor de 12 años hace | 2

| aceptada

Respondida
Poisson random number generator
Mark Steyvers has written a nice book titled "Computational Statistics with MATLAB" which can be downloaded from http://psiex...

alrededor de 12 años hace | 0

Respondida
Constraining a fitted curve
I'd strongly recommend that you look at a file exchange submission by John D'Errico titled "Shape Modeling Language" http://w...

más de 12 años hace | 0

| aceptada

Respondida
Curve fitting with fails misarebly
Couple comments: Curve Fitting Toolbox includes a lot of nice code that will automatically choose "good" starting points for ...

más de 12 años hace | 1

Respondida
How to remove outliers?
Hi Michael MATLAB doesn't provide a specific function to remove outliers. In general you have a couple different options to ...

más de 12 años hace | 0

Respondida
normal distribution test
Statistics Toolbox offers a number of hypothesis tests that you can use to (formally) test whether your data is normally distrib...

más de 12 años hace | 1

Respondida
PCA princomp help please
There are some examples where Principal Component Analysis is used for regression. Traditional regression analysis assumes ...

más de 12 años hace | 0

Respondida
How to use the outputs of the Stepwise function?
Hi John The stepwise function in Statistics Toolbox is used for liner regression. If you want to use a stepwise type alg...

más de 12 años hace | 0

Respondida
Perform sequential feature selection for classification of noisy features - code explanation
Hi Adrian I did a two part series on Loren Shure's blog contrasting feature selection techniques with regularization. The ar...

más de 12 años hace | 1

Respondida
Non-linear regression
For what its worth, I just took a very quick look at the data set that you provided. years = [1982 1983 1984 1985 1986 1987...

más de 12 años hace | 0

Respondida
uncertainty and curve fitting
If you need confidence intervals nlinfit is a better option

más de 12 años hace | 0

| aceptada

Respondida
Non-linear regression
I'd strongly suggestion that you watch a webinar titled "Electricity Load and Price Forecasting with MATLAB". The webinar is av...

más de 12 años hace | 1

Respondida
Linear Regression - more weight on specific Bins of data
MathWorks tech support has a solution documenting various options for weighted regression. http://www.mathworks.com/support/s...

más de 12 años hace | 2

Respondida
how to deal with a missing value of a time series?
Hi Yoshiko The treatment of missing data is a fairly complicated topic. The choice of techniques to handle a missing data prob...

más de 12 años hace | 0

Respondida
stats toolbox...fitting a curve to a plot in log log space
Question and a Comment First, the question: It's unclear whether you are trying to do a curve fit or a distribution fit. Yo...

más de 12 años hace | 0

Respondida
Surface fitting tool, results accuracy
Offhand, I don't know any way to change the display within the tool itself. With this said and done, its fairly easy to 1. ...

más de 12 años hace | 0

| aceptada

Respondida
fitting a polynomial function to data points and ploting it
If you have Curve Fitting Toolbox, you can generate everything you need as follows X = 1:100; X = X'; Y = X.^2 + 3*X + 5 ...

más de 12 años hace | 0

| aceptada

Respondida
SVM Regression
The SVM implementation in Bioinformatics Toolbox does not support Support Vector Regression. With this said and done, the boo...

más de 12 años hace | 0

Respondida
How to fit a curve with forced initial value
Hi Phillippe If you have Statistics Toolbox or Curve Fitting Toolbox its relatively easy to force this type of constraint. ...

más de 12 años hace | 1

| aceptada