The degree to which two variables are correlated. That is, covariance is the measure of how much two variables are related to one another. It is important in security analysis to determine how much or how little price movements in two companies or industries are connected.
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But a huge 37% of all owned games remain unplayed. By Robert Purchese Published 16/04/2014. The most popular games on dominant PC download platform Steam are Valve's, with Dota 2 revelling in an estimated 25.9 million owners, and Team Fortress 2 an estimated 20.3 million owners.