NEW YORK (

TheStreet

) -TheStreet Ratings' stock model upgraded

Allstate Corp

(ALL) - Get Allstate Corporation Report

to 'Buy' from 'Hold'. Net income at this $16.9 billion market cap, insurance company jumped by 333% to a profit of $519 million compared to in the prior first quarter.

TheStreet Ratings released rating changes on 18 U.S. common stocks for April 27, 2011. In total, 11 stocks were upgraded and seven stocks were downgraded by our stock model.

In the first quarter, Allstate reported $8.0 billion in revenue, an increase of 3.7% compared to the year earlier quarter. Learn more about Allstate:

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TheStreet Recommends

$3.4 billion market cap, semiconductor equipment company,

Teradyne Inc

(TER) - Get Teradyne, Inc. Report

was upgraded by our stock model to 'Buy' from 'Hold'. In first quarter results, Teradyne net income of $94.9 million grew by 89.4% over the year earlier quarter. Over the same time period, revenue gained 18.1% to $377 million. Learn more about Teradyne:

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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 equity and mutual fund ratings. 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.