An estimator of the fair price, given the state of the order book.
Video introduction to motivate the microprice: https://www.youtube.com/watch?v=0ZHypIAxYNo
You can download the paper here: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2970694
There are two data files that are meant to help you get started. The iPython notebook contains all the code.