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发表于 2009-2-1 09:29 AM
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Often just called the tick, the market tick refers the sum total of all upticks and downticks, for all stocks, updated continually throughout the day. For example, if the last trade for half of all stocks was an uptick, and the last trade for all of the other stocks was a downtick, the total market tick is zero, or "0." An uptick, regardless of its size, counts as "1" and a downtick counts as "-1." Unchanged stocks are counted as "0". The sum total of all stocks trading on an exchange gives the overall market tick.
The market tick differs from the advance/decline numbers in that only the last trade for each stock is counted. If a stock is up on the day, but trades lower on its last transaction than the previous transaction, that stock is counted as a downtick.
In general, the tick is calculated by each exchange separately. |
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