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Table 5 Items' and scale assessment of scalability (Loevinger's H coefficient), and checks for violation of monotonicity and double monotonicity assumptions (nonintersections of Item Step Response Functions).

From: Revisiting the dimensional structure of the Edinburgh Postnatal Depression Scale (EPDS): empirical evidence for a general factor

   Monotonicity Double monotonicity
Item H No. of violations a Criteria b No. of violations a Criteria b
i1 .4234 0   2 (.0010) 37
i2 .4086 0   3 (.0015) 46
i3 .3770 0   2 (.0010) 35
i4 .3605 1 (.0222) 13 12 (.0062) 82
i5 .4019 0   2 (.0010) 34
i6 .3880 1 (.0159) 11 4 (.0021) 38
i7 .4881 0   3 (.0015) 34
i8 .4673 0   9 (.0046) 70
i9 .4775 0   7 (.0036) 62
i10 .4201 0   0  
Total (scale) .4208 4 (.0039) --- --- ---
  1. a See text for explanation. In brackets: proportion of violation vis-à-vis all possible violations regarding active pairs. See Molenaar, Sijtsma & Boer [52] and Hardouin, Bonnaud-Antignac & Sebille [51] for details.
  2. b See Hardouin, Bonnaud-Antignac & Sebille [51], equation 5 on page 39.
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