Jeff Miller

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511 total contributions since 2013

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Answered
Random numbers with specific sum and varying maximum
How about first picking the maximum "thismax" randomly from whatever distribution you want, and then using randfixedsum to gener...

2 días ago | 0

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Using ranova and multcompare, ranova doen't show significance (p=0.33) but multcompare shows significance between groups (p<0.001)
Note that your anova table doesn't have enough lines--there is no main effect of IndVar, just the IndVar*Time interaction (p=0.3...

2 días ago | 0

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How may I show a mixture distribution?
Here is an example of plotting a mixture that produces a graph similar to yours example: pd1 = makedist('normal',1,1); % proba...

3 días ago | 0

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How to design a Class to apply operations for a collection of data?
This is perhaps a bit subjective, but personally I would strongly prefer the solution with classes that process only a single au...

5 días ago | 0

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histogram normalization not working
The histogram is not wrong, because pdf values can be more than 1. pdf values are normalized such that the total area under the...

6 días ago | 0

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Equal Bin Sizes in Histogram Probability Distribution Function (PDF)
The histogram function has a parameter 'BinEdges' that will allow you to specify any bins you like. So, make whatever bin edges...

7 días ago | 1

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Minimization of Chi-Square Statistic using the Simplex Algorithm
One way to proceed is to write a function which accepts a vector of values for your three parameters, and returns the chi-square...

11 días ago | 0

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How to generate correlated samples from a single distribution? Each sample should be correlated with the previous.
If you don't like the sorting solution, then I think you must consider the joint and conditional distribution of two successive ...

14 días ago | 0

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Inverse Cumulative distribution function
Suppose you have a function called thisCDF which computes the CDF for your distribution. Then define function x = inverseF(p) ...

15 días ago | 0

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How to generate correlated samples from a single distribution? Each sample should be correlated with the previous.
If you don't care about the order of the data points, one option that seems to fulfill your stated requirements is the following...

15 días ago | 0

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I want this for loop to dispaly the smallest calculated value of PE. What would be the best way of going about this?
% something like this: minPE = realmax; for t1 = 0:1:90,t2 = 0:1:90; t1; t2; h1 = -b1*cosd(t1); ...

17 días ago | 0

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Normally distributed Random numbers generator issue
As the other posters have said, you aren't necessarily going to get an exactly normal-looking distribution if you generate the n...

21 días ago | 0

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Repeated-Measures ANOVA across several conditions rather than timepoints
fitrm wants all the data for a single subject to be on a single row of the data table. In your case, that would mean a table ne...

28 días ago | 0

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Converting a weibull figure to a histogram
histogram takes a list of data values (your x's) and tabulates how often each occurs. if you don't already have data values, yo...

28 días ago | 0

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How to fit a dataset with two independant variables (of different dimensions) and one dependant variable?
You need give nlinfit the corresponding 60 values of t and T. Something like this (but check the order of the resulting 60 poin...

29 días ago | 0

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How can I get two-tailed inverse of the student's t-distribution?
Not sure if this is really what you want, but in MATLAB: a=tinv(1-(1-.9973)/2,10-1) a = 4.0942

29 días ago | 1

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How to stop figure windows from popping up when there is no data to plot.
The commands f1=figure('Name','Figure x'); f2=figure('Name','Figure y'); make the two windows pop up, so you must change your...

29 días ago | 1

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How to calculate the confidence interval from distributions overlap
I wouldn't call this a confidence interval either, but I think you can compute the shaded area probability like this: % Values ...

alrededor de 1 mes ago | 0

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probability density function normalization
The pdf values are defined so that the total area under the pdf curve equals 1, but these values will exceed 1 (and, hence, not ...

alrededor de 1 mes ago | 0

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Generate random numbers without repetition according to a probability distribution
I assume you mean a discrete distribution since the probability of repetition is zero in a continuous one. In that case, the ea...

alrededor de 1 mes ago | 0

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How can I evaluate characteristic functions in MatLab?
It seems like your question contains its own answer: mu = 1; sigma = 1; t = -2.5:0.01:2.5; cf = exp(i*mu*t - sigma^2*t.^2/2)...

alrededor de 1 mes ago | 1

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How to perform 1way-ANOVA with matrices
manova might be a better approach, since it allows you to combine information from all three variables (x,y,z) into a single tes...

alrededor de 1 mes ago | 1

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Passing Covariance Matrix in Likelihood Maximization
Sometimes this kind of problem can be solved by adding code within the LogLik function to make sure that a legal (i.e., positive...

alrededor de 2 meses ago | 0

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how can i calculate z^2 distibution?
The distribution of z^2/a^2 is a chi-square with 1 df.

alrededor de 2 meses ago | 0

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How can I get randperm to return a permutation of a vector that has no entries at their original positions?
I don't think randperm can do that by itself, but I think this would work for an even number of items in the original vector: o...

alrededor de 2 meses ago | 0

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R code to matlab, or simply generating a zero mean gaussian and finding the covariance matrix
x=normrnd(0,1,5000,1); v=normrnd(0,0.3,5000,1); y=0.5*x+v; cov=mean(x.*y)-(mean(x)*mean(y)); cov s=cov*(sqrt(var(x)))*(sqrt...

alrededor de 2 meses ago | 0

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Answered
Generating a histogram from lognormally distributed data
What about something like this: mu = 0.015; % mean particle size sg = 1.6; % standar...

alrededor de 2 meses ago | 1

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How to integral a pdf of a continuous random variable to calculate its entropy
Try this: pd = makedist('beta','a',50,'b',40); fun = @(x) pdf(pd,x) .* log( pdf(pd,x) ); H = -integral(fun,0,1)

alrededor de 2 meses ago | 0

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Fit data to beta distribution
There is information here about how to fit a univariate distribution from an empirical CDFs with MATLAB. Unfortunately, it is a ...

alrededor de 2 meses ago | 0

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how to create a pdf function of two variables that are in different uniform distribution
If they are independent then the joint pdf is the product of the marginal pdfs, so in this case pdf(x,y) = 0.01

alrededor de 2 meses ago | 0