***From March 2014 - December 2015 explicit data was cut off in the public data sets - please see updated files that were most recently uploaded From 2004 to present, the USA IAT was available on the Project Implicit UK website (https://implicit.harvard.edu/implicit/uk/selectatest.jsp Click on “Countries” to try it yourself). The USA IAT includes one standard IAT (Good vs. Bad; United Kingdom vs. United States), sets of explicit measures on attitudes related to the countries (such as preference for United States and United Kingdom etc.), set of demographic questions (age, gender, race, major, political identity, etc.), and debriefing questions about how respondents thought about their IAT score after the task. From 2004 to the end of 2016, there are 68,411 session IDs created for the USA IAT, and the overall completion rate is around 40.1%. There are 33,604 respondents who completed the standard IAT part of the task, which is 49.1% of the total respondents. Please contact Project Implicit at admin@projectimplicit.net for any question, comment or zip code data request.