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CSM Media Research is a joint venture between CTR Market Research and the Kantar Media. Dedicated to TV & radio audience measurement research, CSM Media Research offers reliable and uninterrupted rating information for China including the Hong Kong SAR. CSM Media Research operates the world's largest TV & radio audience measurement panel network, covering more than 57,000 households and 188,000 individuals. CSM's TV audience measurement network provides data that represents the viewing of 1.2 billion people in mainland China and 6.3 million people in the Hong Kong SAR. The radio network represents the listening of 80 million people in China. As of May, 2011, CSM delivers data from 184 TAM panels (1 national panel, 25 provincial panels, and 158 city panels including the Hong Kong SAR) which provide data independently, measuring the viewing of 1,249 unique TV channels all day, every day of the year. In addition, CSM has built radio audience measurement panels in 34 cities and 2 province, measures the listening of 416 radio frequencies.