The stock market closed higher Thursday, although indexes pared gains. The Nasdaq climbed 0.8% while the S&P 500 and Dow Jones industrial average added 0.5%. Volume rose on the NYSE, but fell on the Nasdaq, according to early figures. Advancing stocks led decliners by 7-to-5 on the Nasdaq, but winners barely edged out losers on the NYSE. Computer, trucking and financials ranked among the day’s top performing sectors.