# Questions tagged [probability-or-statistics]

Questions about systematic data collection and organization, or the application of probability theory to model the inherent patterns and properties of sampled data, underlying data distribution(s) or random processes.

1,303 questions
Filter by
Sorted by
Tagged with
91 views

...
30 views

### How to represent nodes in a probability tree

I was trying to investigate the following problem I made up: A bag contains n distinctly coloured marbles. A marble is drawn at random. It is replaced and a second identical marble of the same colour ...
94 views

### Compute the potential of confusion between two matrices

I have a problem. Any help will be appreciated. In order to calculate the accuracy, sensitivity, sensibility and F1 score between diseases and their symptoms, I have two matrices with a different ...
49 views

### Estimated LogMultinormalDistribution

How to use procedures designed for EventData for an event data in the bivariate form? That means the bivariate data containing each of the four combinations ...
88 views

### Plotting 90% confidence ellipses for a gaussian pdf with small variances

Mathematica noob here, and I'm having some issues plotting 90% confidence ellipses of a small-variance 2D Gaussian PDF. I have it working perfectly fine for larger covariance matrices, but absolutely ...
98 views

Let's define ...
70 views

I am trying to find the noise covariance matrix of a random vector $\mathbf{x}$ with itself. The elements of this vector represent image pixels and are treated as random variables i.e, $\mathbf{x}=\{... 1answer 44 views ### Expectation of two independent random variables I would like to compute the following function of two independent random variables: ... 3answers 143 views ### Slow performance of TransformedDistribution I am trying to use TransformedDistribution for a data analysis task. The distribution performs well with RandomVariate applied. ... 1answer 76 views ### Drawing from InverseWishartMatrixDistribution. A machine precision error? I'm drawing from the Inverse-Wishart Distribution, but I got the following error message: ... 2answers 301 views ### Plot of histogram similar to output from @risk In order to analyze simulated data, @risk provides a histogram with handle bars, so that we can move these handles to see what proportion of data are on each side. For example, . I am trying to ... 2answers 86 views ### Multiple unique random samples? I'm trying to produce$n$random samples from a list, but not all samples, and I'd like the samples to not repeat in the same execution of the command. If I'm not mistaken, something like ... 0answers 65 views ### Perform a constrained integration over$[-1,1]^6--yielding a “separability probability”

To begin with, I have a set of three positivity constraints (ensuring the positivity of a certain (twelve-parameter) $6 \times 6$ "density matrix", denoted in the standard manner as $\rho$, namely, <...
100 views

### How can I make a frequency plot of successful trials? [closed]

I have got different files with the result of an experiment varying 2 variables. The files are in this link. Each file has 3 columns of data: the first column is the same for all the rows of the file ...
189 views

79 views

### Generating FittedModels from vector-valued linear model fits

I have vector-valued data with normally distributed noise that I want to analyse. Assumptions on data can be made; in this specific example, it's expected that components of fitted vector values ...
77 views

1k views

### Sisyphus Random Walk

A Sisyphus Random Walk evolves as follows: With probability (r) you advance the position of the walker by +1. With probability (1-r) the walker resets at x0 = 0. To simulate the probability of reset ...
61 views

### How to define mixtures of random variables? [closed]

I am confused by the behavior of MixtureDistribution, even though that sounds like what I would need. Let's say I want to get a parametric solution for the ...