NEW YORK (

TheStreet

) -TheStreet Ratings' stock model upgraded

Mentor Graphics

(MENT)

to 'Buy' from 'Hold'. Net income at this $1.2 billion market cap, electronic design automation manufacturer rose to $15.3 million in the fiscal third quarter compared to a loss of $27 million in the same quarter last year.

TheStreet Ratings released rating changes on 17 U.S. common stocks for November 19, 2010. In total, ten stocks were downgraded and seven stocks have been upgraded by our stock model.

In the third quarter, gross revenue at Mentor Graphics increased by 26.3% to $238.9 million when compared to the same quarter last year. Learn more about Mentor Graphics:

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$3.5 billion market cap, homebuilder and mortgage banker,

NVR Inc

(NVR) - Get Report

was downgraded to 'Hold' from 'Buy'. In third quarter results, NVR's gross revenue decreased by 16.7% to $681.2 million, while the company's profits fell 39% to $43.9 million when compared to the year earlier quarter. Learn more about NVR Inc:

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-- Reported by Chris Stuart in Boston, MA.

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Chris Stuart, CFA, equity research manager, joined TheStreet.com Ratings after working as a senior investment analyst with Merrill Lynch, covering Small Cap Equity and Alternative investment strategies. Prior to that, Chris gained analytical and investment experience, working for One Beacon Insurance as an Actuarial Analyst, and H&R Block as a Financial Advisor. He earned his Bachelor's degree in Finance from the University of Massachusetts Amherst. He holds a Chartered Financial Analyst (CFA) designation, and is a member of the Boston Security Analysts Society (BSAS) and the CFA Institute.