Data of
Trautmann, Stefan T., Ferdinand M. Vieider, & Peter P. Wakker (2008) “Causes of Ambiguity Aversion: Known versus Unknown Preferences,” Journal of Risk and Uncertainty 36, 225-243.

Data of Experiment 1: All data (nothing but choices) are described in the main text.
Data of Experiments 2 & 3 (excel file).