Investors more bullish on good earnings and less bearish on bad

U.S. stock market investors are showing their bullish bias this earnings season, buying big on companies that beat expectations and going easy on selling companies that miss.

What's happening: "Shares of companies that topped forecasts rose an average of 2% in the two days after reporting results, beating the five-year average of 1%, according to data compiled by FactSet. Those that fell short have averaged a 2.1% pullback, below the half-decade average of 2.6%," WSJ's Michael Wursthorn reports.