There was a young, incredibly well spoken, and intelligent analyst on Mad Money last week from JP Morgan (Matthew Boss) who leads retail coverage for $JPM. He went on to explain that they buy satellite time and point it down at malls and count the traffic going in and out of the malls to make forecasts. Individual investors have no chance against that in terms of market data, but that's fine. Let them over analyze, over trade, and underperform.
EDIT: Just found a link to the full video interview. Worth a watch: