200-Day Moving Average Line
Is determined by taking the closing price over the past 200 trading days and dividing by 200, then repeating the process each succeeding day, always dropping off the earliest day.
Source: Edwards, Robert and Magee, John.Technical Analysis of Stock Trends 9th Edition; (c) 2007.
Source: Charts created by Bloomberg LP. All rights reserved. Click here for more information on Bloomberg.
The followig shows a 200 Day Moving Average on the same chart as a 50 Day Moving Average.
Source: Charts created using TradeStation. ©TradeStation Technologies, 2001-2009. All rights reserved. www.TradeStation.com