title: [Evaluating correctly the validity of a rating scale: the numerous pitfalls to avoid].
abstract: The validity is the most important quality of a rating scale, but unfortunately it is very badly evaluated in practice. The different facets of the concept: content, criterion, construct, face validity are thoroughly studied. Each facet is accurately defined and the experimental and statistical methods used are explained in detail. Finally practical recommendations are given.
authors.affiliation: Laboratoire de Biostatistique et d'Informatique Médicale, Hôpital Necker-Enfants Malades, Paris.
authors.forename: J
authors.initials: J
authors.lastname: Fermanian
mesh_terms: D015982:Bias; D003627:Data Interpretation, Statistical; D006801:Humans; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*
vernacular_title: Evaluer correctement la validité d'une échelle: les nombreux pièges à éviter.