"Earnings are not a reason to be buying stocks right now," Knapp says.
Talley Leger, investment strategist at Macro Vision Research, notes that the stocks that have helped propel the market higher in January are companies in so-called "defensive" sectors — such as health care providers and consumer staples producers. Those industries continue to perform well when the economy slows down because people still need to buy medicine and basic goods like shampoo and diapers.
"The market is slowly starting to realize that an air pocket opened up between where stocks thought the economy was and where the economy actually was," Leger says.
Leger and others predict a dip in the market sometime in the next three months as investors realize economic and corporate growth aren't quite as strong as predicted.
But that could allow the stock market to grow again in the second half of the year. While the economy might not yet be ready to accelerate quickly, analysts remain confident that it will keep growing.
And even if the market rises only modestly from here, it could still make for a strong year. As Howard Silverblatt, an analyst at S&P, notes, January performance is a good indicator of annual performance. In 61 of the last 84 years the direction of the market in the first month matched the direction of the market for the year.
AP Business Writer Steve Rothwell contributed to this report.
Follow Jonathan Fahey on Twitter at http://twitter.com/JonathanFahey.