Answered

How to find 'within group correlation'?

I would guess the idea is this: grp0 = t == 0; grp1 = t == 1; corr(x(grp0,:)) corr(x(grp1,:))

How to find 'within group correlation'?

I would guess the idea is this: grp0 = t == 0; grp1 = t == 1; corr(x(grp0,:)) corr(x(grp1,:))

9 days ago | 0

Answered

matrix of random distribution

n = 8; % whatever n you want sd = 1; % whatever you want for the standard deviation of the normal distribution in ...

matrix of random distribution

n = 8; % whatever n you want sd = 1; % whatever you want for the standard deviation of the normal distribution in ...

13 days ago | 1

| accepted

Answered

generate random sample for linear regression

% First you have to define the characteristics of x1, x2, and e. % These can be any values you want, such as: mu1 = 0; % M...

generate random sample for linear regression

% First you have to define the characteristics of x1, x2, and e. % These can be any values you want, such as: mu1 = 0; % M...

19 days ago | 1

| accepted

Answered

Detect collinear points in a 3d points cloud

This is going to be a pretty fuzzy suggestion: Maybe you can speed things up by temporarily throwing away precision. The idea i...

Detect collinear points in a 3d points cloud

This is going to be a pretty fuzzy suggestion: Maybe you can speed things up by temporarily throwing away precision. The idea i...

21 days ago | 0

Answered

How can I generate Conditional Lognormal distribution

Those mu and sigma values don't look right for lognormal distributions. These distributions have only positive values, so they ...

How can I generate Conditional Lognormal distribution

Those mu and sigma values don't look right for lognormal distributions. These distributions have only positive values, so they ...

22 days ago | 0

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Answered

log likelihood output from the distribution fitter app

Just be a bit careful here... I think those log likelihood values are likelihoods under the maximum likelihood parameter estima...

log likelihood output from the distribution fitter app

Just be a bit careful here... I think those log likelihood values are likelihoods under the maximum likelihood parameter estima...

28 days ago | 0

Answered

Finding P-Values with the Null Hypothesis Being a Coefficient Equal to 0

The easiest way is with the corr function, because the p value for the slope is the same as the p value for the correlation coef...

Finding P-Values with the Null Hypothesis Being a Coefficient Equal to 0

The easiest way is with the corr function, because the p value for the slope is the same as the p value for the correlation coef...

29 days ago | 0

Answered

How do I set a seed to generate different random initial numbers and storing them

Maybe the FileExchange contribution RNGMgr will be helpful.

How do I set a seed to generate different random initial numbers and storing them

Maybe the FileExchange contribution RNGMgr will be helpful.

1 month ago | 0

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Answered

How to accurately process an Anderson Darling test?

Looks to me like the same problem as in your previous question. MATLAB's 2-parameter Weibull starts from a minimum of 0, but Mi...

How to accurately process an Anderson Darling test?

Looks to me like the same problem as in your previous question. MATLAB's 2-parameter Weibull starts from a minimum of 0, but Mi...

1 month ago | 2

| accepted

Answered

Where is the coefficient for the reference condition when using 'fitlm' to perform ANOVA with intercept omitted?

Why not just use this? for iGrp=1:5 stderr = std(y(x==iGrp)) / sqrt( sum(x==iGrp) ) end

Where is the coefficient for the reference condition when using 'fitlm' to perform ANOVA with intercept omitted?

Why not just use this? for iGrp=1:5 stderr = std(y(x==iGrp)) / sqrt( sum(x==iGrp) ) end

1 month ago | 0

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Answered

How to solve for 3 parameters for a Weibull distribution

Here is what I get using Cupid: Build_Array_Final{1}=[214.42,214.99,215.35,215.98,221.08,222.54,214.78,215,215.32,215.75,217.06...

How to solve for 3 parameters for a Weibull distribution

Here is what I get using Cupid: Build_Array_Final{1}=[214.42,214.99,215.35,215.98,221.08,222.54,214.78,215,215.32,215.75,217.06...

1 month ago | 0

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Answered

How to find the minimum of the function?

fminsearch is a good place to start

How to find the minimum of the function?

fminsearch is a good place to start

1 month ago | 0

Answered

Distribution that works with positive and negative skewness

The skew normal is in Cupid. The last parameter controls the amount and direction of skew. E.g., posSkew = SkewNor(10,1,2); p...

Distribution that works with positive and negative skewness

The skew normal is in Cupid. The last parameter controls the amount and direction of skew. E.g., posSkew = SkewNor(10,1,2); p...

2 months ago | 0

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Answered

how can I do a double summation with dependent indices?

Sorry, I am having trouble relating your code to your equation, and I would have no idea how to do this with syms. But maybe go...

how can I do a double summation with dependent indices?

Sorry, I am having trouble relating your code to your equation, and I would have no idea how to do this with syms. But maybe go...

2 months ago | 0

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Answered

Random samples from combination of poisson distributions

One easy way to generate a random score from a poisson mixture distribution is to randomly select the particular poisson first a...

Random samples from combination of poisson distributions

One easy way to generate a random score from a poisson mixture distribution is to randomly select the particular poisson first a...

2 months ago | 0

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Answered

How can I calculate the 95% confidence interval for spearman correlation values?

I don't think there are formulas for that but you can estimate it with bootstrapping: mycorr = @(x1,x2) corr(x1,x2,'Type','Spea...

How can I calculate the 95% confidence interval for spearman correlation values?

I don't think there are formulas for that but you can estimate it with bootstrapping: mycorr = @(x1,x2) corr(x1,x2,'Type','Spea...

2 months ago | 0

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Answered

Finding the t values of the Student's t test (t1-α,ν)

critt = tinv(1-alpha,v)

Finding the t values of the Student's t test (t1-α,ν)

critt = tinv(1-alpha,v)

2 months ago | 0

| accepted

Answered

Draw PDF and CDF of random values of distance from a 10X10 matrix

I'm guessing you want the empirical PDF and CDF functions (that will change slightly every time you rerun the code, due to rando...

Draw PDF and CDF of random values of distance from a 10X10 matrix

I'm guessing you want the empirical PDF and CDF functions (that will change slightly every time you rerun the code, due to rando...

2 months ago | 0

Answered

How to find 2d spearman and kendall correlations using corr2?

corr2 is doing the same computation as corr, except that it allows 2d inputs rather than 1d. So, you can get your Spearman or K...

How to find 2d spearman and kendall correlations using corr2?

corr2 is doing the same computation as corr, except that it allows 2d inputs rather than 1d. So, you can get your Spearman or K...

2 months ago | 0

| accepted

Answered

calculate empirical distribution function and interpolation

You want to use the regress function, something like this: X = [ones(size(temp) temp)]; % temp is a column vector of temperatu...

calculate empirical distribution function and interpolation

You want to use the regress function, something like this: X = [ones(size(temp) temp)]; % temp is a column vector of temperatu...

2 months ago | 0

Answered

How to find P value in chi2inv

Not sure what you are asking, but maybe p = chi2cdf(3.7920,df,'upper') where df is the degrees of freedom for your computed ch...

How to find P value in chi2inv

Not sure what you are asking, but maybe p = chi2cdf(3.7920,df,'upper') where df is the degrees of freedom for your computed ch...

2 months ago | 0

Answered

Updating multiple variables randomly with a constraint in a while cycle

You might be able to do what you want with nested while loops, something like this. Pretty tedious though. x = zeros(6,1); st...

Updating multiple variables randomly with a constraint in a while cycle

You might be able to do what you want with nested while loops, something like this. Pretty tedious though. x = zeros(6,1); st...

2 months ago | 0

Answered

How to test for a main effect of the between subjects-variable with fitrm and ranova?

% Define the within-Ss factor and give it a name. The 1 & 2 refer to Awake / Asleep WithinStructure = table([1 2]','VariableNa...

How to test for a main effect of the between subjects-variable with fitrm and ranova?

% Define the within-Ss factor and give it a name. The 1 & 2 refer to Awake / Asleep WithinStructure = table([1 2]','VariableNa...

2 months ago | 0

Answered

fitgmdist for loop; nested for loop, combine array of different sizes

I don't really follow what you are trying to do, but maybe some of these comments will help a bit: I. Use a cell array to outpu...

fitgmdist for loop; nested for loop, combine array of different sizes

I don't really follow what you are trying to do, but maybe some of these comments will help a bit: I. Use a cell array to outpu...

2 months ago | 1

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Answered

How do I fit multiple Gaussians to my data?

From the new graph you've posted, it looks like the values in AbsY are not the type of data expected by fitgmdist, and I suspect...

How do I fit multiple Gaussians to my data?

From the new graph you've posted, it looks like the values in AbsY are not the type of data expected by fitgmdist, and I suspect...

2 months ago | 1

Answered

How to compare appropriateness of fitted Weibull and lognormal models via the likelihood ratio test

Unfortunately the likelihood ratio test cannot be used this way. It is only for comparing nested models (i.e., one model has to...

How to compare appropriateness of fitted Weibull and lognormal models via the likelihood ratio test

Unfortunately the likelihood ratio test cannot be used this way. It is only for comparing nested models (i.e., one model has to...

2 months ago | 0

| accepted

Answered

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...

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...

2 months ago | 1

Answered

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...

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...

2 months ago | 0

Answered

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...

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...

2 months ago | 0

| accepted

Answered

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...

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...

2 months ago | 0

| accepted