Measurement of interrater agreement for the assessment of language proficiency

provided capitalizing on the dispersion index for ordinal variables proposed by Giuseppe Leti. The procedure allows to avoid the problem of restriction of variance that sometimes affects traditional measures of interrater agreement in different fields of application. Rating data on a Likert scale regarding a study of assessment of language proficiency conducted at Roma Tre University are used for a comparison of the new procedure with some known measures of interrater absolute agreement.