Scaling methodology and scale reporting in the TREE2 panel survey. Documentation of scales implemented in the baseline survey (2016)

This paper documents the questionnaire-based scales and item-based composites that have been collected on the occasion of the baseline survey administered to the second TREE cohort (TREE2) in 2016. First, the paper focuses on the methods and the estimation procedures that we have adopted for the calculation of the student scores published in the scientific use data files. Second, we describe the calculation of scale-specific statistics and quality measures (reported in the technical appendix) and provide some clues for their interpretation.