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...

9 Tage 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...

9 Tage 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...

10 Tage 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...

12 Tage 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...

13 Tage 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...

14 Tage 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...

18 Tage 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 ...

21 Tage 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) ...

22 Tage 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...

22 Tage 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); ...

24 Tage 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...

28 Tage 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...

etwa ein Monat 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...

etwa ein Monat 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...

etwa ein Monat 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

etwa ein Monat 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...

etwa ein Monat 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 ...

etwa ein Monat 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 ...

etwa ein Monat 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...

etwa ein Monat 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)...

etwa 2 Monate 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...

etwa 2 Monate 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...

etwa 2 Monate 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.

etwa 2 Monate 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...

etwa 2 Monate 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...

etwa 2 Monate 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...

etwa 2 Monate 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)

etwa 2 Monate 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 ...

etwa 2 Monate 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

etwa 2 Monate ago | 0