psychohistory

noun2

1. •
   The scientific study of psychology and motivation in history.

   • Pick argues that the general rejection of psycho-history by practising historians has left the story of ‘historical’ psychoanalysis on the shelf. — 2012
2. •
   A fictional mathematical statistical science of large population dynamics, where mathematical models can predict general futures, based on activities of quadrillions of individuals. The fictional science first occurs in Asimov's 1950s Foundation series, and has since been picked up by other authors for other works.