This was followed by two items with almost the same degree of importance: by "emotional state: no mood swings" (Item 5; 1,644 coefficient) and "duration of effect: long (all day)" (Item 1; 1,437 coefficient).
The results show that regardless of the mood score used, the coefficient of the mood score is positive for all deciles and portfolios.
Furthermore, the regression coefficient of the mood variable is statistically significant in all cases.
The results show that the regression coefficient of the mood variable is positive and statistically significant in the large majority of the cases.
The regression coefficient of the mood variable is positive and statistically significant for all deciles and portfolios suggesting that the behavioral hypothesis is a possible explanation for the day of the week effect.
Interestingly, although the methodologies differ, the linear correlation coefficient between the mood scores in our survey and Farber's is very high at −0.98.4 Such a high correlation coefficient suggests that, although the samples are more than 50 years apart, attitudes toward days of the week have not changed much.
Cronbach α coefficients for the Mood subscales in this study ranged from 0.78 to 0.92, indicating good reliability.
The French version of the DIGS revealed excellent inter-rater reliability in terms of kappa and Yule's Y coefficients for major mood and psychotic disorders [ 56] and substance use disorders [ 57], whereas the 6-week test-retest reliability was slightly lower [ 56, 57].
Convergent and discriminant validity were verified by high correlation coefficients with other ADL/IADL measures and by low correlation coefficients with measures of mood and disturbing behaviour.
The Cohen Kappa coefficients for other anxiety disorders, mood disorders, and psychotic disorders were 0.79, 0.88, and 0.91 respectively.
