Here is an explanation of the historical volume charts for AstroPower:
The top chart plots the average daily volume on a monthly basis for APWR over the past 5 years. Linear Trend is plotted in blue. Note that this trend is derived after the seasonal component is removed from the data.
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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