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Jeff Miller


256 total contributions since 2013

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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...

4 days 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.

7 days 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...

18 days 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...

23 days 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, ...

23 days 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;

2 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...

2 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...

2 months 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...

2 months 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...

2 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

2 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

Answered
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, ...

3 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...

3 months ago | 0

Answered
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 ...

3 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.

3 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...

3 months ago | 0

Answered
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...

3 months ago | 1

Answered
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...

3 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

3 months ago | 1

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Answered
Estimating a regression model using matlab
g=randn(1000,1); error=randn(1000,1); % Model: g(2:end)=k1+ k2*(g(1:end-1)-k1) + error(2:end)*k3 ; y = g(2:end); x1 = g(...

3 months ago | 0

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Answered
Comparing table values using IF statements
Change if uRiDdD(k,1) == allContacts(i,1) to if uRiDdD{k,1} == allContacts{i,1}

3 months ago | 1

Answered
How do I extract elements from a table according to specific conditions?
I think if you want to select rows then the colon operator is in the wrong place, and that you would want something like T1(str...

3 months ago | 0

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Answered
Skew Normal and Owen's T function
Here is an updated link: http://people.sc.fsu.edu/~jburkardt/m_src/asa005/tfn.m

3 months ago | 0

Submitted


BudgetCluster
Routines for running many tasks in parallel across several computers---essentially a low-budget, low-hassle substitute for a clu...

3 months ago | 2 downloads |

Answered
How to calculate the skewness and kurtosis from MATLAB gaussian mixture model function---fitgmdist ?
The gaussians in the mixture have different means and sigmas, but since they are gaussians they all have the same skewness (0) a...

3 months ago | 0

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Answered
linear fit with fitlm or regress
Your three variables are y, temp, and sigma? If I understand the model you want to fit, you might get a cleaner picture if you ...

3 months ago | 0

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Answered
Randomly dividing an integer (non-uniform distribution)
There are any number of ways to do that, depending on exactly what you mean by "considerably". Here are a few: %% Transform th...

3 months ago | 1

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Answered
How to minimize this function
If the problem is to find good starting parameter values, then maybe you could start with a grid search over your parameter spac...

3 months ago | 0

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