Quote from JoshDance:
Basically, yes -- NYSE TICK and delta are, from my recollection of seeing side-by-side examples, often similar; though TICK is a snapshot of upticks and downticks and therefore oscillates, whereas delta can be summed and therefore is not oscillatory in nature. Uptick and downtick can be used to measure delta, or actual traded volume. So, they measure different things, BUT are often quite similar.
You also have a cumulative TICK and oscillator Delta

http://traderfeed.blogspot.com/2006/09/cumulative-nyse-tick-valuable-measure.html
http://www.ninjatrader.com/support/forum/showthread.php?t=5251
http://www.zerohedge.com/article/cu...-shape-even-broad-index-will-have-you-believe
