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Jeff Miller


273 total contributions since 2013

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Answered
Monte Carlo Simulation to generate 10,000 data from 100 data.
Here is one way: originalSample = rand(100,1); % You have your own original sample. This is some fake data to use instead for ...

1 jour ago | 0

Answered
Monte Carlo Simulation Result Tabulation
% rand(2,5) doesn't do what you seem to think. Try this % (with a little extra code that might help you see how to do this in ...

2 jours ago | 0

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Answered
Histogram Fitting in Matlab
First, I suggest you change the histogram plot so that the frequencies are represented by the areas of the different bars rather...

4 jours ago | 1

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Answered
zeros in data for gamma distribution
rain1positive = rain1(rain1>0);

12 jours ago | 0

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Answered
How to add a time limit to response time?
One way is to use GetSecs, which returns the current time. For example, MaxWait = 1.5; % As an example, suppose you want a ma...

13 jours ago | 0

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Answered
Parameters for Frechet Distribution
You could write a function to compute -log(likelihood of your data) from alpha & beta, then use fminsearch to find the alpha,bet...

17 jours ago | 0

Answered
Convolution of two probability density function
I don't know whether you can do this directly in MATLAB. If not, you can do it using the Cupid toolbox. Here is an example: %...

20 jours ago | 0

Answered
How can i merge 2 cells with different items
function str3 = mergefields(str1,str2) % Note: Returns the value in str2 for any field that is common % to both str1 & str2. ...

21 jours ago | 0

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Answered
Convolution of two log normal distributions
Convolutions are pretty easy to do in Cupid. For example, the following code gives the attached figure muX = 9.7224; % For Ni D...

26 jours ago | 0

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Answered
How to fit a general curve on different datasets ?
You need to set up separate independent variables for each dataset, something like this: %% Example of two datasets (3 scores e...

environ un mois ago | 0

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Answered
How to get the OLS estimate from a regression based on a vector?
How about this: deltay = diff(y); b = regress(deltay,y(1:end-1));

environ un mois ago | 0

Answered
How perform anova tests after using regress in MATLAB?
Elisa, I think this might do what you want: %linear regression d1 = D(:,1); d2 = D(:,2); d3 = D(:,3); t = table(d1,d2,d3);...

environ un mois ago | 1

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Answered
How perform anova tests after using regress in MATLAB?
It's a little difficult to say because "perform ANOVA" can mean several different things with regression models. Usually the be...

environ un mois ago | 0

Answered
How to create a fit with more than 2 independent variables?
You might be able to do it with fminsearch, which is a very general fitting tool. The basic idea is that you write a function t...

environ 2 mois ago | 1

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Answered
How can I distinguish between an semi exponential and Gaussian distribution.
You could check the skewness, since exponentials are quite skewed and normals are not.

environ 2 mois ago | 0

Answered
2 way anova for pre post design
First reformat your data to have one row per individual. The data table 'tbl' should look something like this: Group t1 ...

environ 2 mois ago | 0

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Answered
Joint Probability of Dependent Variables
You might want to use the FileExchange contribution for joint kernel density estimation

environ 2 mois ago | 0

Answered
How can I find a p-value when dealing with a weighted sum of chi-square distributions?
I think you have to work out the distribution of the weighted sum and then check the p value in that. Here is an example, assum...

environ 2 mois ago | 0

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Answered
Need to append several pdf files into one global pdf file.
PDF Split and Merge works well, and it's free / open-source.

2 mois ago | 0

Answered
Generate random numbers from a mixture distribution
> With this formula I obtain a concatenation from 2 distribtutions but not a mixture. Well, a mixture is just a concatenation f...

2 mois ago | 1

Answered
Estimate the parameters of a skewed normal distribution knowing p5, mean and p95
Here is one script for doing this with Cupid. I don't think you are guaranteed to be able to hit all three targets exactly (not...

3 mois ago | 0

Answered
Lognormal probability density function Fitting to experimental data
I'm guessing that your rp values are the tops of various bins and that the fp values are the probabilities in each bin? If so, ...

3 mois ago | 0

Answered
How to use Power Analysis to Estimate Mu for Exponential Distribution
I don't think the sampsizepwr function is appropriate here. Although the sampling distribution of the mean of exponentials is a...

3 mois ago | 0

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Answered
How can I make one of my parameters always greater than another one?
beta = alpha0 + rand;

4 mois ago | 1

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Answered
.mat file name as a variable
use uigetfile to manually select the file name, so that you have the name as a string, fname. Then you can use load(fname) to l...

4 mois ago | 0

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Answered
Matlab repeated measures anova - different result than in other packages
Hi again Rose, After playing around with this some more, I think the secret is to tell MATLAB that any numerically-coded catego...

4 mois ago | 0

Answered
Conduct 2x3 repeated measures ANOVA using ranova()
% Describe within-Ss design: WithinFacs = table([1 1 1 2 2 2]',[1 2 3 1 2 3]','VariableNames',{'C1','C2'}); % In the next line...

4 mois ago | 0

Answered
ranova with two within factors
datatable.Properties.VariableNames = {'pre_A','pre_B','post_A','post_B'}; % When you have more than one repeated-measures fac...

4 mois ago | 1

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Answered
How to perform Welch ANOVA?
You have to download these functions from FileExchange--they are not built-ins. E.g. wanova

4 mois ago | 0

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Answered
Re-centering a t-skew distribution
I take it you want to find the values a,b for a linear transformation such that newScores = a + b*oldScores; Presumably you ca...

4 mois ago | 0

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