Question: Psychohistory is a fictional science in which Isaac Asimov science fiction book series which combines history, sociology and mathematical statistics to make predictions about the future behaviour of very large groups of people and most notably described in his trilogy series which won him the Hugo award and which reference other works by the author including 'Robot' and 'Empire'?
Sentence (from "Foundation's Edge"): It was written more than thirty years after the stories of the original "Foundation" trilogy, due to years of pressure by fans and editors on Asimov to write another, and, according to Asimov himself, the amount of the payment offered by the publisher.
Relevant evidence: No