title: A Rasch analysis of the Stanford Hypnotic Susceptibility Scale, Form C.
abstract: The psychometric structure of the Stanford Hypnotic Susceptibility Scale, Form C (SHSS:C) was tested in a Rasch analysis using data from 279 subjects. The Rasch model is the model of choice because it justifies the use of the sum of the item scores as a measure for the underlying construct. Rasch analysis revealed that use of a single sum score (number of suggestions passed) to express hypnotic ability is not sufficiently justified. However, the omission of the mosquito-hallucination and anosmia items (Items 3 and 9) rendered this short 10-item form of the SHSS:C sufficiently compatible with requirements of one-dimensionality, local stochastic independence,and equi-discriminability. Hence, the 10-item form justifies use of a sum score.
authors.affiliation: University of Nijmegen, the Netherlands. g.naring@psych.kun.nl
authors.forename: Gérard W B
authors.initials: GW
authors.lastname: Näring
authors.forename: Kees A L
authors.initials: KA
authors.lastname: Hoogduin
authors.forename: Charlotte M P
authors.initials: CM
authors.lastname: Keijser
mesh_terms: D005163:Factor Analysis, Statistical; D006801:Humans; D006990:Hypnosis; D015233:Models, Statistical; D015588:Observer Variation; D010552:Personality Assessment / Q000706:statistics & numerical data*; D011594:Psychometrics / Q000706:statistics & numerical data*; D015203:Reproducibility of Results; D013269:Stochastic Processes; D013334:Students / Q000523:psychology; D013404:Suggestion