Data reliability: Lessons from the 75-year-old National Sample Survey
Live MintAt an event to commemorate 50 years of the National Sample Survey in 2001, the then prime minister Atal Bihari Vajpayee noted that these surveys had contributed “invaluable raw material" to India’s development plans, even though their contribution was often “unseen and unhonoured." “It is not often recognized that behind every piece of statistical information lies the dedicated work of hundreds of NSS investigators who have conducted painstaking surveys and interviews, often in remote areas," he said. The 1999-2000 NSS consumption expenditure survey suggested that poverty had declined sharply compared to the mid-90s, Vajpayee pointed out. The third lesson pertains to the limits of a centralized model of data collection: While the success of NSS spawned similar experiments globally, no Indian state was able to build a survey organization of similar standing.