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Richard Willey


MathWorks

Active since 2011

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Answered
Crossvalidation of Classification Trees?
I recommend that you look at the following example from the file exchange http://www.mathworks.com/matlabcentral/fileexchange...

mer än 9 år ago | 0

Answered
linear regression
Alternatively, if you have the 12a version of Statistics Tbx X = [1,2,3,4,5,6,7,8,9]; Y = [4 5 6 9 8 7 4 1 2]; my...

mer än 9 år ago | 1

Answered
How to apply Random walks ?
MATLAB includes a wide variety of functions that can be used to simulate a random walk. Depending on what precisely you want to...

mer än 9 år ago | 1

Answered
What is a reasonable lower time limit for regstats?
MATLAB and Statistics Toolbox provide a variety of ways to perform a regression. For example, if I am performing a simple linea...

mer än 9 år ago | 1

Answered
Parametric bootstraping in curve fitting
In general when I hear the expression parametric bootstrap I think "parametric residual bootstrap" I'm attaching some simple ...

mer än 9 år ago | 1

| accepted

Answered
How do I Regression Fit a SinWave to a dataset?
Here's some simple code that illustrates how to perform nonlinear regression using the 12a release of Statistics Toolbox. Not...

mer än 9 år ago | 1

Answered
Homework help.
Couple quick questions / comments 1. are you sure you typed in the model correctly? This looks very close to a Gompertz fun...

mer än 9 år ago | 0

Answered
Curve fitting f(x,y) result
I'm attaching code that shows a couple different ways to solve your problem. I prefer the second option. The R^2 is slightly...

mer än 9 år ago | 1

Answered
Curve fitting f(x,y) result
Hi ZazOufUMl A "Poly31" model is different than the one that I suggested. (Poly31 will contain a number of cross terms). ...

mer än 9 år ago | 0

Answered
Curve fitting f(x,y) result
Hi there The "Poly54" fit type is specifying a 5th order polynomial in one direction and a 4th order polynomial in the other....

mer än 9 år ago | 0

Answered
Matlab - How to Generate Random Numbers from a Specific Probability Density
If Pv and Pa can both be described as functions of a, you might be able to use a univariate generator to generate plausible valu...

mer än 9 år ago | 0

Answered
Multicolinearity/Regression/PCA and choice of optimal model (2nd try)
I'm attaching some code that might provide helpful I also have a two part blog posting on this same subject that provides a b...

mer än 9 år ago | 0

| accepted

Answered
The problem of using rng to generate random numbers.
From the sounds of things, the simplest thing to do would be to generate all of your random numbers OUTSIDE your loop. Start ...

mer än 9 år ago | 0

Answered
The problem of using rng to generate random numbers.
It's hard to make a specific recommendation without known more about the use case. What (specifically) are you trying to acco...

mer än 9 år ago | 0

Answered
classifier
I did a webinar a couple years titled: "Computational Statistics: An Introduction to Classification with MATLAB". You can ...

mer än 9 år ago | 0

Answered
Surface Fitting Tool Coefficient Structure
Local regression (aka LOWESS/LOESS) and interpolation don't lend themselves to parametric representations. There really isn't a...

mer än 9 år ago | 0

| accepted

Answered
Curve smoothing using Matlab
I have a function called FitIt on the file exchange that might prove useful. FitIt combines Local regression (to smooth yo...

mer än 9 år ago | 0

Answered
Get Y values from Curve Fitting Tool
For simplicity, this code is using a simple linear model. However, the same syntax with work for your nonlinear regression. ...

mer än 9 år ago | 7

| accepted

Answered
Least squares linear regression when squares have to do with elasticity?
Here's a simple example using the new regression functions in the 12a release. All you need to do is pass the appropriate weigh...

mer än 9 år ago | 1

Answered
Multi-parametric fit with matlab
Hi Miguel fitensemble is able to handle multiple independent variables. You should be able to use this with the data set tha...

mer än 9 år ago | 0

| accepted

Answered
Multi-parametric fit with matlab
Hi Miguel From the sounds of things, your central problem is that you're unable to specify an equation that describes the rel...

mer än 9 år ago | 0

Answered
Classifiers. How can i draw 3-D plot ?
I have a webinar entitled An Introduction to Classification with MATLAB. The code is available for download from the file exc...

mer än 9 år ago | 0

Answered
How to merge two similar functions into a same function? any mathematical modeling method or tool box?
Hi Qian Implicitly, you seem to be suggesting that there is a single model that describes both of these sets of data. Rather...

mer än 9 år ago | 0

Answered
Classifiers. How can i draw 3-D plot ?
The SVM implementation in Bioinformatics Toolbox is limited to binary classification. The Naive Bayes classifier in Statistic...

mer än 9 år ago | 1

Answered
How to obtain Std of Coefficients from Curve Fitting
Hi George Conveniently, 12a also has a function call NonLinearModel %% Generate some data X = 2* pi*rand(100,1); ...

mer än 9 år ago | 0

| accepted

Answered
How to obtain Std of Coefficients from Curve Fitting
The 12a release of Statistics Toolbox has some very nice new capabilities for regression analysis. %% Generate some data ...

mer än 9 år ago | 0

Answered
how do I determine the probability distribution of data?
Sorry if this sounds like a silly question: Is there an absolute requirement that you describe your data using a parametric d...

mer än 9 år ago | 0

Answered
How to get regression statistics for several run with different data sets?
Hey there The following code assumes that you have the 12a release of Statistics Toolbox. (In other words, I am using the ne...

mer än 9 år ago | 0

Answered
Need help in getting a polynomial to go through 0,0
I'm attaching code that illustrates how to solve the problem using either Statistics Toolbox or base MATLAB. The Statistic ...

mer än 9 år ago | 0

Answered
Matlab 2012a
Statistics Toolbox includes a lot of impressive new functionality for regression analysis. I'm attach code for a blog post th...

mer än 9 år ago | 0

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