Pre-registration: IIF Battery, release 2.1

Pre-registration of the psychometric evaluation of the IIF Battery, release 2.1 (Ideological Identity Fusion Inventory with FUSEI and FEARI modules). It fixes in advance the hypotheses, sample stages (150, 300 and 600 responses per battery), analyses, thresholds, exclusions and what happens if a test fails. No release 2.1 data had been collected when it was published. The instrument itself is attached and is also deposited as release 2.1 of 10.5281/zenodo.19591872. Summary: https://defusingideas.com/methods