Document Type : Research Article

Author

Abstract

The aim of this study was to investigate psychometric properties of theEarly/Late Preference Scales.200 personnel selected using simple random method (92 male, and 108 female) completedthe Early/Late Preference Scale, and Morningness-Eveningness Question-naire. To assess the reliability of measure, α coefficient, and to examine the validity of this measure, exploratory factor analysis (Varimax rotation), and confirmatory factor analysis were administered.Principle components analysis (Varimax rotation) on the Early/Late Preferences Scale revealed three factors: General activity, Morningness, and eveningness accounted for 48.83% of the variance. The greater portion of this variance (24.48%) was accounted for by the first factor. Also, confirmatory factor analysis showed preference for determined the three-factor model by one modification over the one-factor model by two modifications. Cronbach's α coefficient (internal consistency) was acceptable for the whole scale and in extracted factors. Correlation coefficient between each item of the scale with the total score of the items ranged between 0.41 to 0.64 and all were statistically significant (p≤0.001). Concurrent validity coefficient between this scale and Morningness-Eveningness Questionnaire (M-EQ) was -0.40. These results support the use of the PS as a brief instrument for assessing the hierarchical structure of Early/Late Preference Scale in a variety of participants.

Keywords

فارسی
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