Database Reference
In-Depth Information
Figure 2-2. Long-term trends such as the sharp increase in activity leading up to and during the
2008-2009 economic crisis become apparent by visualizing the trade volume data for the New York
Stock Exchange over a 10-year period.
Keeping long-term histories for trades of individual stocks and for total trading volume as a
function of time is very different from the old-fashioned ticker tape reporting. A ticker tape
did not record the absolute timing of trades, although the order of trades was preserved. It
served as a moving current window of knowledge about a stock's price, but not as a long-
term history of its behavior. In contrast, the long-term archives of trading data stored in mod-
ern TSDBs let you know exactly what happened and exactly when. This fine-grained view is
important to meet government regulations for financial institutions and to be able to correlate
trading behavior to other factors, including news events and sentiment analytics signals ex-
tracted from social media. These new kinds of inputs can be very valuable in predictive ana-
lytics.
Search WWH ::




Custom Search