Article: Zacks Upgrades and Revisions Strategy highlights: Assurant Inc., Frontier Oil Corp., MarkWest Energy Partners LP and MasterCard.

CHICAGO -- Earnings estimate revisions are the most powerful force impacting stock prices. Couple that with the proven benefits of upgrades in ratings from brokerage firms and you have a strategy that delivered a +23.3 return in 2006. Four stocks meeting this screen's exclusive criteria are Assurant, Inc. (NYSE: AIZ), Frontier Oil (NYSE: FTO), MarkWest Energy Partners LP (NYSE: MWE) and Mastercard (NYSE: MA). View the entire list of stocks for the Upgrades and Revisions Profit Track at http://at.zacks.com/?id=1844

Here are details on four companies currently identified by the Upgrades and Revisions Profit Track:

Assurant, Inc. (NYSE: AIZ) has recently ...

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