Use Sector Analysis To Improve Stock Trades December 4, 2000 TradingMarkets Editors Before you buy a stock, first examine its industry index to determine if the sector is in an up trend. You will increase your winning percentage because being in the right sector is just as (if not more) important than picking the right stock. —Manuel Ochoa, from The TradingMarkets.com Guide to Conquering the Markets (1999 M. Gordon Publishing Group, Malibu, Calif.).