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Jeff Miller


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387 total contributions since 2013

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Answered
log likelihood output from the distribution fitter app
Just be a bit careful here... I think those log likelihood values are likelihoods under the maximum likelihood parameter estima...

4 days ago | 0

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Finding P-Values with the Null Hypothesis Being a Coefficient Equal to 0
The easiest way is with the corr function, because the p value for the slope is the same as the p value for the correlation coef...

5 days ago | 0

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How do I set a seed to generate different random initial numbers and storing them
Maybe the FileExchange contribution RNGMgr will be helpful.

8 days ago | 0

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How to accurately process an Anderson Darling test?
Looks to me like the same problem as in your previous question. MATLAB's 2-parameter Weibull starts from a minimum of 0, but Mi...

11 days ago | 2

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Where is the coefficient for the reference condition when using 'fitlm' to perform ANOVA with intercept omitted?
Why not just use this? for iGrp=1:5 stderr = std(y(x==iGrp)) / sqrt( sum(x==iGrp) ) end

15 days ago | 0

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How to solve for 3 parameters for a Weibull distribution
Here is what I get using Cupid: Build_Array_Final{1}=[214.42,214.99,215.35,215.98,221.08,222.54,214.78,215,215.32,215.75,217.06...

15 days ago | 0

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How to find the minimum of the function?
fminsearch is a good place to start

15 days ago | 0

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Distribution that works with positive and negative skewness
The skew normal is in Cupid. The last parameter controls the amount and direction of skew. E.g., posSkew = SkewNor(10,1,2); p...

23 days ago | 0

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Answered
how can I do a double summation with dependent indices?
Sorry, I am having trouble relating your code to your equation, and I would have no idea how to do this with syms. But maybe go...

29 days ago | 0

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Random samples from combination of poisson distributions
One easy way to generate a random score from a poisson mixture distribution is to randomly select the particular poisson first a...

1 month ago | 0

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How can I calculate the 95% confidence interval for spearman correlation values?
I don't think there are formulas for that but you can estimate it with bootstrapping: mycorr = @(x1,x2) corr(x1,x2,'Type','Spea...

1 month ago | 0

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Finding the t values of the Student's t test (t1-α,ν)
critt = tinv(1-alpha,v)

1 month ago | 0

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Draw PDF and CDF of random values of distance from a 10X10 matrix
I'm guessing you want the empirical PDF and CDF functions (that will change slightly every time you rerun the code, due to rando...

1 month ago | 0

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How to find 2d spearman and kendall correlations using corr2?
corr2 is doing the same computation as corr, except that it allows 2d inputs rather than 1d. So, you can get your Spearman or K...

1 month ago | 0

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Answered
calculate empirical distribution function and interpolation
You want to use the regress function, something like this: X = [ones(size(temp) temp)]; % temp is a column vector of temperatu...

1 month ago | 0

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How to find P value in chi2inv
Not sure what you are asking, but maybe p = chi2cdf(3.7920,df,'upper') where df is the degrees of freedom for your computed ch...

1 month ago | 0

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Updating multiple variables randomly with a constraint in a while cycle
You might be able to do what you want with nested while loops, something like this. Pretty tedious though. x = zeros(6,1); st...

1 month ago | 0

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How to test for a main effect of the between subjects-variable with fitrm and ranova?
% Define the within-Ss factor and give it a name. The 1 & 2 refer to Awake / Asleep WithinStructure = table([1 2]','VariableNa...

1 month ago | 0

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fitgmdist for loop; nested for loop, combine array of different sizes
I don't really follow what you are trying to do, but maybe some of these comments will help a bit: I. Use a cell array to outpu...

1 month ago | 1

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How do I fit multiple Gaussians to my data?
From the new graph you've posted, it looks like the values in AbsY are not the type of data expected by fitgmdist, and I suspect...

1 month ago | 1

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How to compare appropriateness of fitted Weibull and lognormal models via the likelihood ratio test
Unfortunately the likelihood ratio test cannot be used this way. It is only for comparing nested models (i.e., one model has to...

1 month ago | 0

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Answered
how can i check the geometric distribution
Look at the Wikipedia page on this distribution and it will tell you how to estimate the parameter from your observations (it de...

2 months ago | 1

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Use 'trandn' function to draw random numbers from a lognormal distribution
An easy way to get random numbers from a lognormal distribution is to get random numbers from a normal distribution and then exp...

2 months ago | 0

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Ploting the result of a fitgmdist (of 1D data)
Say you want to plot the distribution from -15 to 15 in steps of 0.05. This would be the code: z = (-15:0.05:15)'; % Note th...

2 months ago | 0

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Answered
Ranking Variables by Value
You might find the second output of the sort command useful. E.g. fruitVals = [p_a p_b p_o p_p]; [~, idxOrder] = sort(fruitVa...

2 months ago | 0

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Answered
help random numbers generator
Good. Here it is as an 'official' answer: pd = makedist('Normal'); t = truncate(pd,-0.5,0.5); r = random(t,10,1);

2 months ago | 0

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Answered
How to generate random numbers from a scaled beta PDF?
Generate regular beta random numbers and then rescale them. I guess you want to generate randomly from the regular beta(3,3) di...

2 months ago | 0

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Answered
Why does stepwiselm function output NaN with model interactions?
Multivariate techniques like stepwise regression require more cases (rows) than variables--in practice, you need at least 5-10 t...

2 months ago | 0

Answered
Concatenate string to string array in efficient way
strMsgArray = strcat(strStart,strMsgArray,strEnd)

2 months ago | 0

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Answered
question related to Statistics in matlab
r=poissrnd(9,200,1); will give you 200 random numbers from a poisson distribution with lambda=9. Lots of those numbers will be...

2 months ago | 0

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