Lexis ratio

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The Lexis ratio, also known as Q, is a ratio used in statistical analysis to evaluate how data compares to a Bernoulli distribution. It is computed as follows:

Where σ is the variance given from a set of Lexis trials and σB is the variance computed from the expected Bernoulli distribution. Trials where L falls significantly above or below 1 are known as supernormal and subnormal, respectively.

Subnormal trials are particularly of note because they tend to indicate that the data follows a Poisson distribution.