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Jeff Miller


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519 total contributions since 2013

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Answered
generating correlated random variables
Generate C1-C6 separately (independently) from whatever lognormal you want. Then generate C7-C8 as a pair with the desired corr...

6 jours ago | 0

Answered
Stop signal task - pre error speeding
I think it would be cleanest to start by making a vector to indicate which trials precede unsuccessful stops, which can be done ...

15 jours ago | 0

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Answered
How to make Anova table for data from a factorial experiment
x = readtable('mack_data.txt'); x.Properties.VariableNames = {'o1','o2','o3','o4','o5','m1','m2','m3','m4','m5'}; withinDesign...

18 jours ago | 1

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Answered
How to create a cumulative frequency array
This is inelegant, but it works: cumFreq = zeros(size(V)); for i=1:numel(V) cumFreq(i) = sum(Z<V(i)); end

18 jours ago | 1

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Answered
Define a density function and draw N samples of it
I don't think that density function is right--seems like you at least need to include the mixture probabilities in there--e.g., ...

20 jours ago | 0

Answered
Function to create struct with parameters
Maybe you would like something like this? month = 1; year = 1951; day = 11; inp = CreateStruct(month,day,year) function o...

20 jours ago | 0

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Answered
How do I declare correlation between a random variable with beta distribution and a random variable with normal distribution?
Something like this would work, though you would have to adjust rho by trial and error to get the final corr(x1,x2) value that y...

23 jours ago | 0

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Answered
Extract columns into new variables efficently
A= [1 1 2 2 3 3 1 1 2 2 3 3; 1 1 2 2 3 3 1 1 2 2 3 3]; B = [10 20 30 40 50 60 70 80 90 100 110 120; 1 2 3 4 5 6 7 8 9 10 11 12]...

25 jours ago | 0

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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...

environ un mois ago | 0

Answered
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...

environ un mois ago | 0

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Answered
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...

environ un mois ago | 0

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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...

environ un mois ago | 0

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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...

environ un mois 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...

environ un mois 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...

environ un mois 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 ...

environ 2 mois ago | 0

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

environ 2 mois 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...

environ 2 mois ago | 0

Answered
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); ...

environ 2 mois ago | 0

Answered
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...

environ 2 mois ago | 0

Answered
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...

environ 2 mois 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...

environ 2 mois 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...

2 mois ago | 0

Answered
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

2 mois 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...

2 mois 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 ...

2 mois 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 ...

2 mois 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...

2 mois 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)...

2 mois 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...

2 mois ago | 1

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