mealy reimagines statistics as a mealy machine processing data with some form of order such as time-series data. The Mealy, with the help of a decay function specifying the relative weights of recent values versus older value, can be treated as a compression or summary of the data stream into 'current state.' Mealies are highly polymorphic, situated at a busy crossroad of theory and practice, and lend themselves to ergonmic, compact and realistic representations of a wide range of online phenomena.