LE REGOLE DI CALCOLO E LA SELEZIONE DEGLI ITEM

The chapter illustrates the processoseguito in the construction of the interview and its coding system and measurement. After building the system of taxonomic classification of the stimuli and correspondence stimulus to stimulus, with the classification of types, defines the rules for calculating the three analytical dimensions of the construct (axes) and evaluated the discriminative power of each item. It is a question of whether and how each of the questions-stimuli provided in the initial version of the interview is able to offer a measure congruent and discriminating with respect to the synthetic measure the size in question, determined by the summative evaluation of all items of the axis, and proceed, where necessary, to his exclusion.