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ADV-DCL-Definition



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Hi List,

does anybody  **exactly**  know how the NYSE Advancing Issues and NYSE 
Declining Issues are calculated?

In general the reflect the advanced and declined shares, but how they cam,e to 
their numbers?

Are the prices of the shares compared to the prices of the trading day before? 

What does the sum of ADV & DCL & UNC mean?
Why is this sum different:  small at open and high at close?
I thougt it would represent the no. of 'share-names' beeing' traded.
How came that this sum is increasing as well.

For example from futuresource (yesterday numbers):
	at open ADV = 380 & DCL:713 & UNC:~167   =  1260
	at close: ADV: 2440 & DCL: 1658 & UNC: 152  = 4250

Thanks in advance for your effort,
Carl