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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...

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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...

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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...

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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...

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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);

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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...

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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...

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

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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...

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Calculate Convolution 2 pdf random variables
The built-in conv function is for something else, not statistical convolutions. In general, the probability density function of...

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How to do an unpaired t-test?
I'm guessing you have some kind of numerical score in each of 120 trials for each of (say) 30 subjects and you want to know if t...

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Overall fir of binomial general linear model
People don't normally test the overall significance of these models. Instead, they look at the significance of the individual p...

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Bootstrap alternative to t-test dependent measures does not produce same p values
The p values are not that far off, given that the t-test is based on the assumption of normally distributed difference scores an...

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pdf of two distribution in mixture
the pdf of the mixture is just the weighted average of the pdfs of the beta and gamma, something like p_beta = 0.8; % probabil...

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Convolution and tolerances: how do I calculate the probability density function of the difference between two dimensions? (mechanical engieering)
In general, if h(x) and s(x) are the PDFs of the hole and shaft, respectively, then the PDF d(x) of the difference d=h-s is d(x...

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How to generate mixture of exponential and beta distribution
Check whether I have interpreted your parameters correctly, but it should look something like this: lambda = 0.5; a = 4; b = ...

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Different functions with different variables as input
I think you can do this by bundling up the arguments for each function in a cell array. It would look something like this (unte...

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How to compute lower tail probability for the Bivariate Normal Distribution
The function 'mvncdf' computes the lower tail probability for the multivariate normal distribution.

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Pregunta

Can I call integralCalc directly to bypass integralParseArgs?
I'm trying to speed up a function Foo that calls 'integral' thousands of time. The profile viewer reveals that more than half of...

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How to use original n-th moments formula to calculate mean, skewness and kurtosis in uniform distribution?
I don't think mean(x) gives you what you want inside fun. Try this: fun = @(x,n) (x-0.5).^n;

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What statistical test is available in matlab for unbalanced samples other than ttest?
One possibility is the Wilcoxon rank sum test.

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How can I generate integer random variables by using exponentially distributed with a mean of 20 seconds?
If you just want integers, then use the geometric distribution instead of the exponential: r2 = geornd(1/mu2,sz1,sz2);

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Negative correlation between two random vectors
Alternatively, generate independent variables and then combine them to create a new variable that they are correlated with. E.g....

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For loop to evaluate Root Mean Square
I don't really understand what you mean by conditions, but maybe you can get what you want by thinking of a 2-step process where...

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Compare empirical CDF and lognormal CDF
logncdf wants the mean and sd of the logged scores. Try this: fit_s=logncdf(sort(SD) , mean(log(SD)) , std(log(SD)) );

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How to plot a mixed density function?
x=-6:.01:10; pdf1 = normpdf(x,1,1); pdf2 = normpdf(x,4,1); mixpdf = 0.5*pdf1 + 0.5*pdf2; figure; plot(x,mixpdf);

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How to load the letter and their log probabilities in database.txt into our program?
This function on FileExchange simply returns a long list of all the numbers in the file. Since it looks like your file has the ...

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ranova(rm) ranovatbl contains only NaN values and zero's
> 'WithinDesign', Meas This doesn't look right with Meas only having one possibility. Try removing that. > all data are fro...

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How to fit complicated function with 3 fitting parameters using Least square regression
I assume you have vectors of values for V and J, in which case fminsearch might be a good choice. The basic steps are: Write ...

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How to carry out a chi-squared distribution fit?
chi2gof is not the function you want here--it is for an entirely different purpose. The last few lines should be something like:...

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