Community Profile # Richard Willey

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

más de 10 años hace | 0

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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...

más de 10 años hace | 1

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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...

más de 10 años hace | 1

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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...

más de 10 años hace | 1

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

más de 10 años hace | 1

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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...

casi 11 años hace | 1

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

casi 11 años hace | 0

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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...

casi 11 años hace | 1

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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). ...

casi 11 años hace | 0

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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....

casi 11 años hace | 0

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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...

casi 11 años hace | 0

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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...

casi 11 años hace | 0

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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 ...

casi 11 años hace | 0

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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...

casi 11 años hace | 0

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

casi 11 años hace | 0

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

casi 11 años hace | 0

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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...

casi 11 años hace | 0

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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. ...

casi 11 años hace | 7

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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...

casi 11 años hace | 1

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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...

casi 11 años hace | 0

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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...

casi 11 años hace | 0

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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...

casi 11 años hace | 0

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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...

casi 11 años hace | 0

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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...

casi 11 años hace | 1

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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); ...

casi 11 años hace | 0

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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 ...

casi 11 años hace | 1

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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...

casi 11 años hace | 0

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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...

casi 11 años hace | 0

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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 ...

casi 11 años hace | 0

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

casi 11 años hace | 0