# Von Mises Distribution: Simple Definition & Examples

Probability Distributions > Von Mises Distribution

## What is the Von Mises Distribution?

The Von Mises distribution (also called the circular normal or Tikhonov distribution) is a continuous probability distribution with a range from 0 to 2π. It is similar to the normal distribution, except coordinates are placed on a circular plane. The von Mises distribution can be thought of as a special case of the Von Mises-Fisher distribution, which is an extension of the distribution to multi-dimensional spheres.

The distribution was first described by Richard von Mises in 1918 as a way to model the distribution of atomic weights. It’s now used to model a variety of phenomena including:

• Brownian motion (Physics),
• Interference Alignment (Signal Processing),
• Privacy-preserving algorithms in (Machine Learning).

## PDF

The general form of the Von Mises PDF is: Where:

The shorthand X ~ von Mises (κ, μ) or X ~ CN(κ, μ) are used to indicate that random variable X has a von Mises distribution with shape parameter κ and location parameter μ.

## Other Characteristics

The median and mean of X is zero.
The following are mathematically intractable (difficult or near-impossible to solve for):

## Software

The Von Mises distribution isn’t part of most popular statistics packages. However, you do have options like add-ons or a specialized directional statistics package.

• Dataplot (open-source) has a built-in VONPPF command.
• Oriana for Windows “…calculates the special forms of sample and inter-sample statistics required for circular data (e.g. angles or directions measured in degrees, time of day, day of week, month of year, etc.).” Current retail price is around \$400.
• Circstats is an add-on package for R (open-source).
• Circstat is a free add on for MatLab.

## References

Grafarend, E. & Awange. J. (2012) Applications of Linear and Nonlinear Models: Fixed Effects, Random Effects. Springer Science & Business Media, Aug 15.
Kotz, S.; et al., eds. (2006), Encyclopedia of Statistical Sciences, Wiley.
Von Mises, R. (1981): Uber die Ganzzahligkeit der Atomgewichte und verwandte Gragen. Phys. Z. 19 (1918), 490-500.

CITE THIS AS:
Stephanie Glen. "Von Mises Distribution: Simple Definition & Examples" From StatisticsHowTo.com: Elementary Statistics for the rest of us! https://www.statisticshowto.com/von-mises-distribution/
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