# Questions tagged [von-mises-distribution]

The von Mises distribution is a continuous distribution defined on the unit circle. The generalization to the $n$-sphere for $n>1$ is the von Mises-Fisher distribution.

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### Why does the von Mises-Fisher distribution need two parameters?

The von Mises-Fisher distribution has two parameters: the mean $\mu \in \mathbb{R}^p$ and concentration $\kappa \geq 0$, where $\mu$ is constrained to have unit norm. Why not instead define the ...
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### Variance of von Mises-Fisher Distribution

As a follow up to this previous question on the expectation of the von Mises-Fisher distribution, what is the variance of a von-Mises Fisher distribution as a function of the mean direction $\mu$ and ...
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### Fitting a von Mises Distribution over the Global Population

For a statistics course I'm taking this semester, we decided to conduct a worldwide survey. One of our questions, is an approximate coordinate of where the respondent lives. Our instructor recently ...
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### How to get the estimated means and standard deviations of two overlapping circular normal distributions?

I have the following plot: Overlapping circular normal distributions I would like to estimate the means and standard deviations of the apparent overlapping normal distributions. This is slightly ...
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### Skewness of Von mises distribution using two different methods

I want to use skewness of circular data using circ_skewness code in MATLAB. I know there are two methods for this: Pewsey, Metrika, 2004 Statistical analysis of circular data, Fisher, p. 34 However,...
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### Skewness and kurtosis of VonMises distribution

I could not find a reference that has mentioned the skewness and kurtosis of a circular data that has Von Mises distribution. What are the values? and it is great if someone can introduce some ...
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### Two sample Kuiper test for checking normality of circular data

I have circular data and want to check whether it is a normal (Von Mises) distribution or not. I do the following steps: Create a Von Mises distribution with the same mean and kappa as my main data. ...
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### Simulate from Circular - Linear Data in R

I would like to simulate, using R, data from the Johnson-Wehrly distribution that is governed by the following pdf: \begin{eqnarray*} f_{X,Y}(x,y) = 2\pi g[2\pi(F_X(x) - F_Y(y))]f_X(x)f_Y(y), \end{...
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### How to prove that von mises distribution belongs to exponential family?

Can anyone help me prove this, I'm not able to simplify the distribution to find the sufficient statistics, log normalizer, etc.
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### Statistical test for comparing directional data

I have a dataset with number of bats flying out in 8 directions from their home site (i.e) I studied a bat colony with N individuals and I have counted the number of bats (from that colony) that flew ...
1 vote
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### Circular variance of a mixture of Von Mises distributions

Does anyone know if there is an analytical solution for the (circular) variance of a mixture of Von Mises distributions that all have equal (circular) mean? Simulation results suggest that the ...
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### Distributions on an ellipsoid?

This is my first question. I hope somebody can help me with this. I am after the name of a distribution and references would be incredibly useful. I am looking for a generalisation of the von-Mises ...
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### Semicircular mean

I am running MCMC sampling to determine an angular parameter resulting in several thousand samples. The angle is restricted to $[0,\pi]$ as we cannot distinguish $\alpha$ and $\alpha+\pi$. For ...
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### How can I fit a normal (von Mises) distribution to discrete angular data?

This bears some explaining: I have a set of data from a psychophysics experiment where participants selected a response from a discrete set of 8 possible responses. These responses were actually ...
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### Circular distributions Kolmogorov-Smirnov vs. Watson test vs. Rayleigh test

I am interested in assessing whether my angular data distribution is satisfactorily described by a von Mises distribution. In scale data, one can potentially use a Kolmogorov-Smirnov test. However, ...
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### 2d KDE with one circular dimension

I have a 2d data set where one dimension is circular (direction and speed). I would like to create a kernel density estimate but am unsure how to create a kernel. One idea I had was to use a von mises ...
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### Estimating von Mises Parameters for Angular Data

I want to model some angular data. Any input on how to incorporate the von Mises distribution and suggestions on appropriate priors in RJAGS for von Mises mean and concentration would be greatly ...
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### Von Mises distribution to detect outliers

I am working out the difference between two angles from a circle, and I work out the mean difference across 96 trials in 10 separate samples. In order to detect outliers for statistical analysis, ...
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### Estimating kappa of von Mises distribution

Is there a way to calculate an estimate of the parameter $\kappa$ from data for the von Mises distribution? It seems very easy to do in R, http://rgm2.lab.nig.ac.jp/RGM2/func.php?rd_id=CircStats:A1inv,...
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### Analysis hierarchical circular mixture data

I have circular data such that multiple human participants were, each shown a color from a color wheel, asked to remember it for a "retention interval", then report it back by clicking a color wheel. ...
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1 vote