I want to know why when I look up information on critical pieces of
information on the stock market different big name sites report
varying data on past events.
specifically I want to know why when I look up the open
interest(amount of options held in market place) on options for a
stock, Ameritrade and Yahoo both have different figures on their
websites, albeit the figures are relatively close. Another specific
question is when looking up even more well known figures such as
Advancers and Decliners of the previous days close in the stock
marker, I here as well find conflicting information. The figures for
Advancers and Delcliners include 1)New highs and lows, 2)advancing and
declining issues, 3)unchanged issues, 4)total issues(yes these sites I
am about to name cannot even agree on how many different stocks trade
on the NYSE, NASDAQ, or AMEX in a given day.) 5)up volume, 6)down
volume, 7)unchanged volume and 8)total volume. When these figures for
Advancers and Decliners are looked up on such well known sites as
Yahoo, CBS Marketwatch, and Net Exchange Client they all give
different figures on a daily basis for these crucial numbers. Why is
this happening, even though I am sure they all have a disclaimer for
the accuracy of their information shouldn't they all be able to tap
into a reliable source and report the correct figures. - Jesse S.