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BOSTON (

TheStreet

) -- TheStreet.com's stock-rating model upgraded human-resources consultant

Administaff

(ASF)

to "buy."

The numbers

: Second-quarter net income decreased 51% to $5.4 million and earnings per share fell 49% to 22 cents. Revenue declined 4% to $404 million. Its gross margin fell from 20% to 18% and its operating margin decreased from 4% to 2%. A quick ratio of 1.3 reflects adequate liquidity. The company holds minimal debt.

The stock

: Administaff is up 23% this year, more than the

Dow Jones Industrial Average

and

S&P 500 Index

. The stock trades at a price-to-earnings ratio of 19, a discount to the market and human resource peers. Shares pay a 2% dividend yield.

The model downgraded cable-TV provider

Comcast

TheStreet Recommends

(CMCSK)

to "hold."

The numbers

: Second-quarter net income jumped 53% to $967 million and earnings per share climbed 57% to 33 cents, boosted by a lower share count. Revenue increased 5% to $8.9 billion. Its gross margin remained steady at 58% and its operating margin was unchanged at 21%. A quick ratio of 0.5 indicates weak liquidity. A debt-to-equity ratio of 0.8 is higher than the industry average, indicating excessive debt.

The stock

: Comcast is down 10% this year, lagging behind major U.S. indices. The stock trades at a price-to-earnings ratio of 15, a discount to the market and cable and satellite peers. Shares pay a 1.9% dividend yield.

The model upgraded

Lexmark

(LXK)

, maker of printers and ink cartridges, to "hold."

The numbers

: Second-quarter net income fell 80% to $17 million and earnings per share dropped 75% to 22 cents, cushioned by a lower share count. Revenue fell 21% to $905 million. Its gross margin decreased from 41% to 40% and its operating margin descended from 10% to 7%. The company has a stable financial position, with $810 million of cash, compared to $649 million of debt.

The stock

: Lexmark has fallen 15% this year, underperforming major U.S. indices. The stock trades at a price-to-earnings ratio of 14, a discount to the market and computer storage and peripheral peers. The company doesn't pay dividends.

The model downgraded medical-device maker

St. Jude Medical

(STJ)

to "hold."

The numbers

: Second-quarter net income grew 14% to $219 million and earnings per share climbed 15% to 63 cents. Revenue increased 4% to $1.2 billion. Its gross margin fell from 78% to 77% and its operating margin was unchanged at 26%. A quick ratio of 1.3 demonstrates adequate liquidity. A debt-to-equity ratio of 0.3 indicates modest leverage.

The stock

: St. Jude Medical has advanced 2% this year, lagging behind major U.S. indices. The stock trades at a price-to-earnings ratio of 28, a premium to the market and health care equipment peers. The company doesn't pay dividends.

The model upgraded

VCA Antech

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, operator of veterinary labs, to "buy."

The numbers

: Second-quarter net income declined 6% to $38 million, or 44 cents a share, as revenue grew 3% to $345 million. Its gross margin was unchanged at 31% and its operating margin remained steady at 22%. A quick ratio of 1.5 reflects adequate liquidity. A debt-to-equity ratio of 0.7 indicates conservative leverage.

The stock

: VCA Antech is up 35% this year, more than the Dow and S&P 500. The stock trades at a price-to-earnings ratio of 18, a discount to the market, but a premium to health care facility peers. The company doesn't pay dividends.

-- Reported by Jake Lynch in Boston.