Stocks edged slightly higher on a quiet day for investors who had little economic data or company earnings to react to. Analysts think the market will stay in a holding pattern until traders hear from new Federal Reserve chair Janet Yellen in her first testimony before Congress Tuesday and Wednesday. The tech-heavy Nasdaq rose on Apple’s $9.31 gain after activist investor Carl Icahn lightened up on his effort to force Apple to increase its stock buybacks. Apple last week said it had bought $14 billion worth of its own stock. Among gainers, Pawtucket, R.I., toy maker Hasbro rose nearly 5 percent on a dividend boost and a bright outlook for 2014.