NEW YORK (

TheStreet

) -TheStreet Ratings' stock model upgraded

Yamana Gold

(AUY) - Get Report

to 'Buy' from 'Hold'. Net income at this $9.2 billion market cap, gold miner grew by 344% to $160 million in the fourth quarter when compared to the year earlier quarter.

TheStreet Ratings released rating changes on 22 U.S. common stocks for February 23, 2011. In total, 14 stocks were upgraded and eight stocks were downgraded by our stock model.

In the fourth quarter, Yamana Gold reported $535 million in revenue, an increase of 33.8% compared to the year earlier quarter. Learn more about Yamana Gold:

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Stock Ratios

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Analyst Ratings

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$6.2 billion market cap, GPS device maker,

Garmin Ltd

(GRMN) - Get Report

was downgraded to 'Hold' from 'Buy'. In fourth quarter results, Garmin reported net income of $133 million, a 52.3% decline when compared to the year earlier quarter. Over the same time period, revenue shrank by 20.9% to $838 million. Learn more about Garmin:

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Income Statement

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Stock Ratios

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Analyst Ratings

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-- Reported by Kevin Baker in Jupiter, FL.

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Kevin Baker became the senior financial analyst for TheStreet Ratings upon the August 2006 acquisition of Weiss Ratings by TheStreet.com, covering mutual funds. He joined the Weiss Group in 1997 as a banking and brokerage analyst. In 1999, he created the Weiss Group's first ratings to gauge the level of risk in U.S. equities. Baker received a B.S. degree in management from Rensselaer Polytechnic Institute and an M.B.A. with a finance specialization from Nova Southeastern University.