This item downloads historical data for three different exchanges (NYSE, AMEX and NASDAQ). It creates 9 symbols; three for the advancers (one for each exchange), three for the decliners and three for the unchanged issues.
Advances and declines are generally used as a market sentiment indicator, a measure of the market strength and weakness. In a rising market, the number of advancing issues will exceed the number of declining issues, whereas in a falling market the number of declining issues will be higher than the advancing issues.
Advance-Decline Line: This is the cumulative sum of the number of advances minus the number of declines.
Advance-Decline ratio: This is the number of advancing stocks divided by the number of declining stocks.
TRIN indicator: This is the AD (Advance-Decline) issues ratio divided by the AD volume ratio.
NB: NYSE data starts in March 1965.
AMEX data starts in February 2002. NASDAQ data starts in January 1978.