Among all the negative economic data that came out last week was a positive surprise: retail sales were higher in January. A fluke or a glimmer at the end of the tunnel? That may depend on whether we see any positive surprises arising from items on this week's economic calendar:

• Consumer Analyst Group of New York Conference: Monday through Friday
• NY Empire Manufacturing Index (Feb. 2009): Tuesday, 8:30 AM
• NAHB Housing Market Index (Feb. 2009): Tuesday, 1:00 PM
• Fed's Bullard speaks before National Association of Business Economists: Tuesday, 1:00 PM
• Housing starts (Jan. 2009): Wednesday, 8:30 AM
• Fed's Pianalto speaks before Commercial Developers Power Breakfast: Wednesday, 9:00 AM
• Industrial production (Jan. 2009): Wednesday, 9:15 AM
• Fed's Bernanke speaks before National Press Club Luncheon: Wednesday, 12:30 PM

MOST NOTEWORTHY: DPL Inc, IAC/InterActiveCorp, F5 Networks, Community Health and Parametric Technology were today's noteworthy upgrades:

• Baird upgraded DPL Inc (NYSE: DPL) to Outperform from Neutral following better-than-expected guidance.
  
• Citigroup upgraded IAC/InterActiveCorp (NASDAQ: IACI) to Buy from Hold as they believe HSN's turnaround, Lending Tree's stabilization and Ask's profitability ramp should drive EBITDA growth acceleration in 2008. The company was also upgraded to Overweight from Equal Weight at Lehman following IAC's better-than-expected Q3 report.
  
• Citigroup upgraded shares of F5 Networks Inc (NASDAQ: FFIV) to Buy from Hold, as they believe now is the time to buy the stock with sentiment at a low-point heading into an attractive 2008 product cycle.
  
• Stifel raised its rating on Community Health Systems Inc (NYSE: CYH) to Buy from Hold based on improved visibility from detailed 2008 guidance.
  
• Kaufman upgraded Parametric Technology Corporation (NASDAQ: PMTC) to Buy from Hold based on an impressive quarter and favorable industry trends.

OTHER UPGRADES:

• China Life Insurance Company Limited (NYSE: LFC) was upgraded to Peer Perform from Underperform at Bear.
  
• The Pep Boys - Manny, Moe & Jack (NYSE: PBY) was upgraded to Neutral from Sell at Goldman.
  
• JP Morgan added Nalco Holding Company (NYSE: NLC) to its Focus List.
  
• RBC upgraded Newmont Mining Corporation (NYSE: NEM) to Sector Perform from Underperform.

MOST NOTEWORTHY: Celgene (CELG), Sysco (SYY), Kinetic Concepts (KCI), BioMimtic Therapeutics (BMTI) and Lifecell Corp (LIFC) were today's noteworthy initiations:

• William Blair believes Celgene (NASDAQ: CELG) has the best growth profile in large-cap biotechnology and initiated shares with an Outperform rating.

• Citigroup views Sysco (NYSE: SYY) as the dominant leader in the foodservice distribution industry, initiating shares with a Buy rating, and feels the company will continue to take market share from its peers. The firm thinks the current valuation reflects the perception that Sysco may perform poorly in the near-term, which they disagree with.

• Wachovia started Kinetic Concepts (NYSE: KCI) with a Market Perform, citing competitive pressures and mature markets for its rating.

• Wachovia is positive on BioMimetic Therapeutics (NASDAQ: BMTI), initiating shares with an Outperform, based on strong rhPDGF technology, strategy, and management team.

• Wachovia is positive on Lifecell Corp's (NASDAQ: LIFC) Strattice, a porcine tissue matrix, which improves the company's international exposure and provides opportunities in new markets, initiating shares with an Outperform...

OTHER INITIATIONS:

• Credit Suisse initiated Community Health (NYSE: CYH) and Universal Health (NYSE: UHS) with Outperform ratings, LifePoint (NASDAQ: LPNT) with a Neutral rating, and Health Management (NYSE: HMA) and Tenet Healthcare (NYSE: THC) with Underperform ratings.

Analyst summaries provided by TheFlyOnTheWall.com (subscription required).