The truthiness package provides functions and data associated with a longitudinal study of the Illusory Truth effect conducted by \insertCiteHenderson_Simons_Barr_2021;textualtruthiness. The illusory truth effect is the observation that people rate repeated statements as more likely to be true. We tested the trajectory of the illusory truth effect by collecting truth ratings for statements repeated across four time intervals: immediately, one day, one week, and one month following initial presentation. The package contains the anonymized data for the study as well as functions for analyzing the data, running simulations, and calculating power. Further details about the project are available at https://osf.io/nvugt/ including Stage 1 of the Registered Report at the Journal of Cognition (https://osf.io/vqnx2/).
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