Market-research firm Kantar Group is selling its media measurement and analytics unit Kantar Media to private-equity firm H.I.G. Capital for approximately $1 billion, the companies said. Kantar Media, which operates in more than 60 markets and employs more than 4,500 people globally, said the deal will renew its focus on providing data to clients to help them make better decisions about their content and advertising. The London-based company’s offerings include cross-platform audience measurement, TV advertising and content ratings outside the U.S., and audience profiling.