Did you look it up? For anybody reading this, psychohistory is a term by Asimov - the science invented by the character Harry Seldon that turns huge amounts of historical data into statistically unerring mathematically proven predictions.
Hyperion is still soft sci-fi and it's awesome, all four books from the so called Cantos.
I bought Altered Carbon almost a year ago and still haven't been able to get to reading it. I've read a translation of volume two about fifteen years ago.