Here is an explanation of the historical volume charts for Compuware:
The main trace on the top chart is the Monthly Average Daily Volume for the company. Blue marks the de-seasonalized trend, which is a least squares linear regression applied to the CPWR prices after seasonal variations have been filtered out.
Typical Seasonal Patterns might show a January Effect, and possibly some quarterly distortions due to the periodic release of financial reports.
Long Term Cyclical Patterns can reflect the degree of public interest in the stock market, as well as interest in the particular company.
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