الخصائص السيكومترية للمقياس العربي للنمط الصباحي-المسائي وفق نظرية الاستجابة للمفردة في سلطنة عمان

الملخص EN

The current study aimed at examining the psychometric properties of the Arabic version of Morningness-Eveningness Questionnaire based on Item Response Theory (IRT) for grades 10-12 students in Muscat.

The study sample consisted of 1315 students in all districts of Muscat governorate.

The study used the appropriate statistical analysis to investigate the assumptions of IRT model (unidimensionality, local independence, model fit) for data of two measures (Arabic version of morningness-eveningness questionnaire, Arabic questionnaire of sleeping disorders).

The study results showed that IRT model was able to interpret students' responses on each item of the questionnaire and on the questionnaire as a whole.

The validity of the questionnaire was examined by different methods: First, the face validity of the questionnaire was checked through asking some specialized experts to evaluate the questionnaire and it was found that the items were appropriate to the students' age.

Second, construct validity was checked using exploratory factor analysis.

The findings indicated that the questionnaire items (21 items) loaded on one factor explaining 21.73% of the total variance.

Third, concurrent validity was examined as the findings showed a negative relationship (r= - 0.13) between students' responses on the morningness-eveningness questionnaire and their responses in the questionnaire of sleeping disorders.

In addition, the reliability of the questionnaire was checked using the information function and the standard error of students’ trait on the questionnaire.

The findings revealed that there was variation in the information provided by each item and the questionnaire gave more information for students who had medium level of the trait.

The marginal reliability of the questionnaire was 0.89.

Also, the students' trait were divided into five categories and the raw score of each trait value was found.

Some recommendations and suggestions were given based on the study findings.