NPR's Jim Zarroli reports that stock prices were mixed on the final trading day of 1998. By some measures, the stock market turned in another strong performance this year. The Dow has risen more than 16 percent in 1998 and the other major indexes did even better. The NASDAQ - riding a huge boom in technology stocks - is up nearly 40% for the year. But most analysts say things weren't as good as they seemed for the market this year.