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How to plot a probability density function on a histogram?
Your code appears to use a variable "score" without defining it. You can create the histogram by calculating it yourself as y...

13년 초과 전 | 1

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plotting multiple boxplots in the same figure window
Here's how to do that with three vectors of different lengths: x1 = rand(10,1); x2 = 2*rand(15,1); x3 = randn(30,1); x =...

13년 초과 전 | 20

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using logistic regression on matlab for given x and y
Here's a way to fit a logistic curve to continuous data using Curve Fitting: >> x = rand(100,1); >> y = 1./(1+exp(-3*(x-...

13년 초과 전 | 0

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How do you choose values from a distribution according to their respective probabilities?
Consider the randsample function if you have the Statistics Toolbox, or look here: <http://www.mathworks.com/matlabcentral/an...

13년 초과 전 | 0

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I got 3 square cluster from 12 (x,y) points. How can I find out which points it is taking for making the clusters?
I may not follow your request. The variable T indicates which row of X belongs to each cluster. If you want to show that on the ...

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how to code to solve for coefficient using linear regression?
It is hard to know what method you should use without understanding the problem more. One method is this. Suppose x and y are co...

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How do I obtain regression coefficients from a large data set?
Perhaps you can build on this. Here I set up some fake data with a known relationship with a single outcome variable. Then I loo...

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coefTest and one tailed T-test
You are right that the result from coefTest is an F-test. There is no built-in way to carry out a one-sided t test. Here are ...

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How to derive a CDF from a given PDF?
If you have the Symbolic Toolbox, you might try replacing normcdf by an erf function and see what you get. Otherwise you coul...

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Is there a way to restrict interactions to a subset GeneralizedLinearRegression.stepwise
Yes, it is possible to specify 'Upper' as a model that is the upper bound of all terms to consider. For example: y = 1 + x1...

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Problem using trapz for obtaining probabilities
I don't quite understand what you are trying to do. I suggest you consider d=0 and step through your code to see why the first n...

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Matlab function for the calculation of G-efficiency and D-efficiency coefficients of D-optimal DoE ?
The D-optimal design maximizes the determinant of X'*X where X is the design matrix. If you have the Statistics Toolbox you coul...

13년 초과 전 | 1

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check whether regression slopes are different between 3 groups
Your code looks right to me. If you have a recent version of the Statistics Toolbox, your job would be somewhat simpler if yo...

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There exists, logspace, linspace, what about probability space?
You haven't said what probability distribution you want. If it's the standard normal distribution, you could try norminv(.1...

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K-means clustering ignoring zero values
In that demo clustering is performed on the variable ab, then the result are reshaped and put into the variable pixel_labels. ...

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Weighted Least Squares, Need Help!!
Well, y.*w multiplies each element of y by the corresponding element of w. To do this with a matrix x having multiple columns, t...

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Corrcoef and R^2 definition give different R^2 values
I would expect your formula to work if simulation is a set of predicted values from fitting ydata using least squares as a funct...

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Understanding output of perfcurve
Could it be that you have relatively few distinct values of classpredict?

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Why is bootci not terminating?
The default bootci 'type' is bca. This requires doing a jackknife and it can take a long time if the number of data rows is larg...

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sampling from a mixture of 2 multivariate Gaussian distributions
If you have the Statistics Toolbox, type "help gmdistribution". You can use it to construct a mixture of two Gaussians, then use...

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unable to fit Gaussian mixture model
I don't know much about analyzing images. But gmdistribution expects its input data to be samples drawn from a Gaussian mixture ...

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nnmf function usage problem
Most Statistics Toolbox functions aren't written to operate on integer data types. Try nnmf(double(resim),100) to convert to dou...

13년 초과 전 | 1

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Boxplot (with several groups/days) + Plot (for each group/day)
Sorry, your frustration led me to try it myself. Here's what I did: a = rand(3,4); b = 10*rand(3,4); figure(1); bar(a...

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Boxplot (with several groups/days) + Plot (for each group/day)
Here's how you can set the color of the first group: h = bar(Y, 'group'); set(h(1),'FaceColor','r') If you are conten...

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wald test or test of equality of means
In an older release, check out "help linhyptest". It can perform a hypothesis test on coefficients given estimates and a covaria...

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integrating the product of two pdf's
Here's an example that you may be able to adapt to your problem. Suppose [x1;x2] have a multivariate normal distribution with...

13년 초과 전 | 2

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integrating the product of two pdf's
What is the "space" variable intended to represent? Based on your integral expression, I'd expect the result to be a function...

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Integration of multivariate normal cumulative distribution function
I assume you really want to integrate the cdf, rather than compute the cdf which is the integral of the pdf. The dblquad func...

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wald test or test of equality of means
I assume you mean you want to test the equality of two regression coefficients. This will work in the current release of the Sta...

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ovlay cdf plot on histogram
It's there but it's on the histogram scale and it is obscured by the bars. Try this instead to put the cdf on a separate y axis:...

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