Statistics How To

Location Parameter in Statistics

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What is a Location Parameter?

The location parameter tells you where on the horizontal axis a graph is centered, relative to the standard normal model. The standard normal distribution curve is centered at 0 (the mean), so a location parameter of 5 lets you know a graph is centered 5 units to the right of the curve’s center, at x = 5.

The normal distribution curve on the left has a location parameter of 0; The normal distribution curve on the right has a location parameter of 10.

location parameter

A location parameter of -10 moves the graph 5 units to the left of zero, at x = -5.

Relationship to translations in geometry

Location parameters are similar the concept of translations in geometry, where a shape is moved in a certain direction depending on the translation. However, in geometry an object can be translated by angle and distance or by x and y. In statistics, the type of translation defined by the location parameter is only a translation on the x-axis.

Notation: The location parameter, μ

A location family is a set of probability distributions where μ is the location parameter. For example, μ = 9 tells you the center of the graph is located at x = 10.

Location parameters and the Mean and Standard Deviation

For the normal distribution, the location parameter is the mean of the data set. However, this is not true for most other distributions.

Location Family

A location family is a class of probability distributions where x0 determines the location of the distribution. Probability density functions or probability mass functions in the location family are defined by the following equation:
Fx0(x) = f(x – x0) where x0 is the location parameter.
If x0 is increased, the graph of the probability function moves to the right on the horizontal axis and if x0 is decreased, the graph moves to the left on the horizontal axis.

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