BOSTON (

TheStreet

) -- Here are four rating changes from

TheStreet's

quantitative stock-rating model.

4.

The model upgraded

Continental Airlines

(CAL) - Get Report

to "hold."

The numbers

: Continental swung to a fourth-quarter profit of $85 million, or 60 cents a share, from a loss of $269 million, or $2.35, a year earlier. Revenue decreased 8.3% to $3.2 billion. The operating margin rose from 0.4% to 2.4%. Continental holds $3 billion of cash and $6.3 billion of debt.

The stock

: Continental has advanced 76% during the past year, outpacing major U.S. indices. The stock trades at a price-to-projected-earnings ratio of 9, a discount to airline peers. Continental doesn't pay dividends.

3.

The model upgraded power producer

Constellation Energy

( CEG) to "hold."

The numbers

: Constellation swung to a fourth-quarter profit of $4.4 billion, or $21.96, from a loss of $1.4 billion, or $7.75, a year earlier. Revenue decreased 30% to $3.4 billion. Constellation's operating margin hit 2.6%. The company holds $3.5 billion of cash and $4.9 billion of debt.

TST Recommends

The stock

: Constellation has increased 66% during the past year, beating U.S. benchmarks. The stock trades at a price-to-projected-earnings ratio of 10, a discount to energy peers. The shares offer a 2.8% dividend yield.

2.

The model upgraded drugmaker

Shire

( SHPGY) to "buy."

The numbers

: Fourth-quarter net income rose 23% to $174 million, but earnings per share rose 2.3% to 89 cents. Revenue grew 17% to $893 million. Shire's operating margin widened to 31%. Its balance sheet contains $532 million of cash and $1.1 billion of debt.

The stock

: Shire has soared 65% during the past year, outperforming major U.S. indices. The stock trades at a price-to-earnings ratio of 24, a premium to pharmaceutical peers. The shares offer a 0.2% dividend yield.

1.

The model downgraded oil and gas services company

Halliburton

(HAL) - Get Report

to "hold."

The numbers

: Fourth-quarter net income dropped 48% to $243 million and earnings per share fell 69% to 27 cents. Revenue decreased 25% to $3.7 billion. Halliburton's operating margin narrowed from 24% to 12%. The company holds $3.4 billion of cash and $4.6 billion of debt.

The stock

: Halliburton has surged 90% during the past year, beating U.S. benchmarks. The stock trades at a price-to-earnings ratio of 24, a discount to energy peers. The shares offer a 1.2% dividend yield.

-- Reported by Jake Lynch in Boston.