Graham and Buffet engaged in"fundamental analysis", which attemptes to determin an implicit value of a company based on business (accounting/financial) information. The traditional source of this information is from balance sheets, income statements, sales figures, and talking with management.

This is drastically different from "quant analysis", which tries to determine a stock price, or engage in arbitrage, from previous movements, relations to other stocks, and a host of other data largely irrelevant to computing the implicit value of a company. This information comes from real-time data streams from god-knows-where.