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Editor's Note: TheStreet ratings do not represent the views of TheStreet's staff or its contributors. Ratings are established by computer based on metrics for performance (which includes growth, stock performance, efficiency and valuation) and risk (volatility and solvency). Companies with poor cash flow or high debt levels tend to earn lower ratings in our model. NEW YORK ( TheStreet) -- The ex-dividend date for MarkWest Energy Partners (NYSE: MWE) is Monday, February 4, 2013. Owners of shares as of market close today will be eligible for a dividend of 82 cents per share. At a price of $55.47 as of 9:31 a.m. ET, the dividend yield is 6%. The average volume for MarkWest Energy has been 927,900 shares per day over the past 30 days. MarkWest Energy has a market cap of $6.44 billion and is part of the basic materials sector and energy industry. Shares are up 7.3% year to date as of the close of trading on Thursday. Markwest Energy Partners, L.P., together with its subsidiaries, engages in the gathering, processing, and transportation of natural gas in the southwest, Gulf Coast, and northeast regions of the United States. The company has a P/E ratio of 111.7, above the S&P 500 P/E ratio of 17.7.