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Jeff Miller


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508 total contributions since 2013

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Answered
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...

2 dagen ago | 0

Answered
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...

3 dagen ago | 0

Answered
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...

4 dagen ago | 1

Answered
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...

8 dagen ago | 0

Answered
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 ...

11 dagen 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) ...

12 dagen ago | 0

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Answered
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...

12 dagen 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); ...

14 dagen 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...

18 dagen 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...

25 dagen ago | 0

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Answered
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...

25 dagen ago | 0

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Answered
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...

26 dagen 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

26 dagen ago | 1

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Answered
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...

26 dagen ago | 1

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Answered
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 ...

ongeveer een maand ago | 0

Answered
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 ...

ongeveer een maand ago | 0

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Answered
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...

ongeveer een maand ago | 0

Answered
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)...

ongeveer een maand ago | 1

Answered
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...

ongeveer een maand ago | 1

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Answered
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...

ongeveer een maand 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.

ongeveer een maand 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...

ongeveer een maand ago | 0

Answered
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...

ongeveer 2 maanden 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...

ongeveer 2 maanden ago | 1

Answered
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)

ongeveer 2 maanden ago | 0

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Answered
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 ...

ongeveer 2 maanden ago | 0

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Answered
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

ongeveer 2 maanden ago | 0

Answered
Calculate Exponetial Moving Covariance
Not really a hand, but maybe some hints...Let's say you have variables x and y, and you want the exponentially weighted rolling ...

ongeveer 2 maanden ago | 0

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Answered
Select sample from an array
Maybe this: ints = [2:7:259 3:7:259 4:7:259 5:7:259]; srtints = sort(ints); X1 = x(:,srtints);

ongeveer 2 maanden ago | 0

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Answered
Kruskal-Wallis test with very small p-values
p values can be anywhere between 0 and 1, depending on your data. a tiny p value like that is telling you that you would very r...

ongeveer 2 maanden ago | 0

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