Exam 1

1. Metainformation

   Tag	Value
   file	Reliability_eur-reliability-107-en_eur-reliability-107-en
   name	eur-reliability-107-en
   section	Reliability/Analysis/Cronbach's alpha
   type	string
   solution	""
   Type	Conceptual
   Program
   Language	English
   Level	Statistical Literacy

   Question

   Why is the assumption of essentially tau equivalent items more liberal than the assumption of parallel items?

   
   

   Solution

   The assumption of essentially tau equivalent items is more liberal than the assumption of parallel items because for essentially tau equivalent items no equal error variance is required. Thus, it only needs one out of the two assumptions required by the concept of parallelism under the classical testing theory (i.e. equality of true scores and equality of error variance).