This industry comprises establishments primarily engaged in systematically gathering, recording, tabulating, and presenting marketing and public opinion data. Illustrative Examples: Broadcast media rating services Political opinion polling services Marketing analysis or research services Statistical sampling services Opinion research services Cross-References. Establishments primarily engaged in-- ? Providing research and analysis in economics, sociology, and related fields--are classified in Industry 541720, Research and Development in the Social Sciences and Humanities; and ? Providing advice and counsel on marketing strategies--are classified in U.S. Industry 541613, Marketing Consulting Services.