AP VoteCast 2018

computer-assisted telephone interview (CATI)~~web-based survey~~VoteCast National Survey The VoteCast survey of voters and nonvoters nationwide is compiled from results of the 50 state-based surveys and a nationally representative survey of 4,913 registered voters conducted on the probability-based AmeriSpeak panel (4,413 completed online and 500 via phone). It includes 40,692 probability interviews completed online (30,133) and via telephone (10,559), and 93,324 nonprobability interviews completed online. The margin of sampling error is plus or minus 0.8 percentage points for voters (n=116,792) and 1.8 percentage points for nonvoters (n=22,137). Registered voters in the District of Columbia were not included. The overall response rate for the probability sample drawn from the state voter files was 4.2 percent. VoteCast State Surveys In 25 states, VoteCast is based on roughly 1,000 probability-based interviews conducted online and via phone, and roughly 3,000 nonprobability interviews conducted online. In these states, the margin of sampling error is estimated to be plus or minus 3.5 percentage points for voters and 8.8 percentage points for nonvoters. In 25 additional states, VoteCast is based on between 475 and 1,000 nonprobability interviews conducted online. In these states, the margin of sampling error is estimated to be plus or minus 8.7 percentage points for voters and 19.2 percentage points for nonvoters.