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Jeff Miller


265 total contributions since 2013

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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...

18 hours ago | 0

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...

6 days ago | 0

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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));

8 days ago | 0

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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);...

11 days 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...

11 days ago | 0

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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...

21 days ago | 1

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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.

21 days ago | 0

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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 ...

22 days ago | 0

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

27 days ago | 0

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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...

1 month 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.

1 month 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 months ago | 1

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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...

2 months ago | 0

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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, ...

2 months 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...

2 months ago | 0

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

3 months 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...

3 months 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...

3 months ago | 0

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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...

3 months ago | 0

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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...

3 months 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

3 months 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...

3 months ago | 0

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N-way ANOVA wrong results
Both of the MATLAB output tables make sense to me, but I don't really know what SPSS is doing. For the MATLAB continuous case, ...

4 months ago | 1

Answered
N-way ANOVA wrong results
The SPSS output does not match up with the data that you posted, so maybe you should check that analysis first. For your connec...

4 months ago | 0

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How to fit a curve above/below another one?
> I am afraid you posted the answer as a comment. Oops. Let this be the follow-up to the above as an answer. >do you have a ...

4 months ago | 1

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Answered
Histogram fitting best distribution
If you haven't tried it already, maybe tell distfit to use the 'kernel' option.

4 months ago | 0

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Answered
How to shuffle with replacement every n values of a given dataset into 1000 new sequences
It might be easier to reshape your matrix so you don't have to worry so much about index bookkeeping. E.g. Seq = 1:5000; Incre...

4 months ago | 0

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How to obtain exponential equation parameter from probplot function?
For a standard exponential distribution, probability = 1 - exp(-lambda*x) where x is the data value and lambda is the paramete...

4 months ago | 1

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Crop a normal distribution to a predefined uniform distribution
Maybe: Choose an interval randomly (e.g., the middle distribution in your original figure seems to have about 14 intervals rang...

4 months ago | 0

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Answered
How to display text in the command window?
if abs(a-b)<0.0001 disp('LHS==RHS') end

4 months ago | 1

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