The psychometric properties of the Refractive Status and Vision Profile (RSVP) questionnaire were evaluated using Rasch analysis. Ninety-one myopic patients from a refractive surgery clinic and general optometric practice completed the RSVP. Rasch analysis of the RSVP ordinal data was performed to examine for unidimensionality and item reduction. The traditional Likert-scoring system was compar...

Eight guidelines are suggested to aid the analyst in investigating whether rating scales categories are cooperating to produce observations on which valid measurement can be based. These guidelines are presented within the context of Rasch analysis. They address features of rating-scale-based data such as category frequency, ordering, rating-to-measure inferential coherence, and the quality of ...

BACKGROUND Several scientific psychologists consider the approach for the study of perceptive problems of the Experimental Phenomenology is problematic, namely that the phenomenological demonstrations are subjectively based and they do not produce quantifiable results. AIM The aim of this study is to show that Experimental Phenomenology can lead to conclusions objective and quantifiable and p...

Performance appraisals have been frequently investigated for inaccuracies attributable to raters. In addition to rater contributions, problems in measurement can arise from properties of instrumentation. If administered items do not parallel the full range of employee performance, a restriction of range can occur. Here employees are rated similarly (no distinction made) not because of rater err...

• Complete revision and update to cover the increased breadth and importance of the field of QoL measurement • A rigorous, broad comprehensive coverage of all aspects of QoL measurement, methods and practice • Gives a new focus on qualitative methods which have become considerably more advanced and now have a stronger scientific basis • Introduces Rasch models and item response theory, the use ...

BACKGROUND Health literacy is an important concept associated with participation in preventive health initiatives, such as falls prevention programs. A comprehensive health literacy measurement tool, appropriate for this population, is required. The aim of this study was to evaluate the measurement properties of the Health Literacy Questionnaire (HLQ) in a cohort of older adults who presented t...

  Background: Quality of life evaluates the general well-being of individuals and it can be considered as one of the important aspects in programming and giving service to disabled people. Blindness is one of the most important kinds of physical disability that has a direct effect on quality of life, so t his study aimed to explore how war blindness influences the quality of life .   Methods: I...

PURPOSE We compare two methods of analysis for Rasch scoring pre- to postintervention data: Rasch lookup table versus de novo stacked Rasch analysis using the Adult Strabismus-20 (AS-20). METHODS One hundred forty-seven subjects completed the AS-20 questionnaire prior to surgery and 6 weeks postoperatively. Subjects were classified 6 weeks postoperatively as "success," "partial success," or "...

PURPOSE To assess the psychometric properties of the Cataract TyPE Specification (Spec) questionnaire using the Rasch model. SETTING Flinders Medical Centre, Adelaide, Australia. METHODS The 12-item Cataract TyPE Spec questionnaire was self-administered to patients drawn from the cataract surgery waiting list. The questionnaire and its 5 subscales were assessed for fit to the Rasch model. R...