Former Chief Economic Adviser Arvind Subramanian recently claimed in a paper that GDP growth from 2011-12 to 2016-17 was only 4.5%, which is 2.5 percentage points than the government's estimate. Which number is more accurate? In a conversation moderated by T.C.A. Sharad Raghavan, Pronab Sen, former Chief Statistician of India, and R. Nagaraj, professor at the Indira Gandhi Institute of Development Research, discuss the methodology in calculation of GDP growth.