US STOCKS-Wall St reverses course to trade higher
* Apple hits record high in erratic trading
* Merck on track for its best day since January 2014
* Feb U.S. single-family home prices rise
* Indexes up: Dow 0.3 pct, S&P 0.2 pct, Nasdaq 0.2 pct (Adds details, comment, updates prices)
By Tanya Agrawal
April 28 (Reuters) - U.S. stocks edged up in volatile trading on Tuesday, reversing earlier declines, on strong earnings from Merck, better-than-expected housing data and a dividend hike from IBM.
A majority of the ten S&P 500 sectors were up, with the teleservices index gaining 1 percent.
Apple hit a record high early on Tuesday, a day after posting strong results. The shares then fell as much as 2.3 percent, weighing on all three major indices, before recovering to trade up 0.3 percent at $133.06
U.S. single-family home prices rose more than expected in February from a year earlier, according to a closely watched survey. Continuación...