noun
chi
A probability distribution for the square root of a chi-squared random variable.
The statistician models the vector's length with a chi distribution.
Etymology
The distribution takes its name from the Greek letter used as a mathematical symbol. The unsquared chi names the positive square root corresponding to a chi-squared variable.
More examples
- A chi distribution depends on its degrees of freedom.
- The plotted curve follows a chi distribution.
- Taking the square root of a chi-squared variable yields a chi variable.
Forms
chi
Similar words
- chi-squared
- Chi-squared describes the squared quantity; chi describes its nonnegative square root.