Development of the Short-Form Yin Deficiency Scale Using Three Item Reduction Approaches

Figure 1

Probability curves of the 7-point (a), 6-point (b), and 5-point (c) responses. For the 7 points, C1 (category 1), disagree very strongly; C2 (category 2), disagree strongly; C3 (category 3), disagree; C4 (category 4), neither disagree nor agree; C5 (category 5), agree; C6 (category 6), agree strongly; and C7 (category 7), agree very strongly. In the 6 points, C3 (disagree) and C4 (neither disagree nor agree) of the 7 points were unified to C3 (disagree). In the 5 points, C4 (agree) and C5 (agree strongly) of the 6 points were unified to C4 (agree strongly).

(a)

(b)

(c)