The sampling design adopted was multi-stage systematic random sampling.
The findings presented here are from post-poll surveys conducted in Assam, Kerala, Tamil Nadu and West Bengal by the Lokniti programme of CSDS, Delhi.
The surveys were conducted from March 28 to April 21 in Assam, April 7 to April 13 in Kerala, April 7 to April 20 in Tamil Nadu, and March 28 to May 1 in West Bengal.
In Assam, the survey was conducted among 3,490 voters at 140 polling stations spread across 35 Assembly constituencies; in Kerala, among 3,424 voters at 140 polling stations of 35 Assembly constituencies; in Tamil Nadu, among 4,354 voters at 160 polling stations in 40 Assembly constituencies; and in West Bengal, among 4,223 voters at 200 polling stations spread across 50 Assembly constituencies.