Nielsen Holdings NV (NYSE: NLSN) has closed a $1.3 billion acquisition of Arbitron Inc.

Arbitron, a media and marketing research firm, is headquartered in New York. Its businesses include measuring network and local market radio audiences, surveying retail, media and product patterns of U.S. consumers, providing mobile audience measurement and analytics and developing application software used for analyzing audiences.

Arbitron is being integrated into information company Nielsen’s U.S. Watch business segment. The segment provides information and insights to the media and advertising industries.

For New York-based Nielsen, the acquisition will expand the ability to measure consumer behavior and introduce audio measurement, including measuring streaming audio, into new markets.

The deal was announced in December. Signal Hill provided financial advice to Arbitron for the transaction.