Demographic Data with Zero-Truncated Poisson

The zero-truncated Poisson distribution is useful to model certain demographic data, such as sizes of households and families ​1​. This post illustrates this on historical data from the United Kingdom and demonstrates how to assess the goodness-of-fit in Python. The zero-truncated Poisson distribution is defined as\begin{align}\mathbf{P}\{Y=x\} = \mathbf{P}\{ X = x | X > 0\}, …