# Category:Uncertainty

This category contains results about Uncertainty.

Let $X$ be a random variable.

Let $X$ take a finite number of values with probabilities $p_1, p_2, \dotsc, p_n$.

The uncertainty of $X$ is defined to be:

$\map H X = \displaystyle -\sum_k p_k \lg p_k$

where:

$\lg$ denotes logarithm base $2$
the summation is over those $k$ where $p_k > 0$.

## Subcategories

This category has only the following subcategory.

## Pages in category "Uncertainty"

The following 2 pages are in this category, out of 2 total.