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Table 5 Estimation of factor loadings and MIRT parameters of items using the pooled panel data

From: Quantifying traditional Chinese medicine patterns using modern test theory: an example of functional constipation

  Pearson’s correlation Factor loadings MIRT parameters
λ 1 (SE) λ 2 (SE) a 1 (SE) a 2 (SE) d 1 (SE) d 2 (SE) d 3 (SE)
1. Dry and hard stool 0.76* 0.76 (0.07)* 0.70 (0.07)* 2.67 (0.31)* 1.54 (0.23)* 3.07 (0.30)* −1.56 (0.20)* −5.96 (0.45)*
2. Prolonged interval of spontaneous defecation 0.73* 0.70 (0.07)* 0.48 (0.09)* 2.20 (0.24)* 1.50 (0.20)* 1.70 (0.20)* −3.09 (0.23)* −6.36 (0.46)*
3. Sensation of incomplete evacuation 0.65* 0.70 (0.06)* 0.32 (0.11)# 1.85 (0.17)* 0.86 (0.18)* 2.60 (0.20)* −1.24 (0.14)* −5.56 (0.40)*
4. Defecation pain 0.78* 0.64 (0.08)* 0.53 (0.10)* 1.97 (0.20)* 1.62 (0.21)* 1.75 (0.18)* −1.53 (0.17)* −5.57 (0.32)*
5. Difficult bowel movement 0.82* 0.68 (0.08)* 0.56 (0.10)* 2.46 (0.26)* 2.02 (0.25)* 3.31 (0.27)* −0.67 (0.19)* −5.26 (0.38)*
6. Abdominal distension 0.77* 0.54 (0.08)* 0.60 (0.08)* 1.57 (0.16)* 1.73 (0.18)* 2.13 (0.18)* −1.36 (0.15)* −6.12 (0.38)*
7. Reduced appetite 0.73* 0.43 (0.09)* 0.65 (0.08)* 1.17 (0.16)* 1.79 (0.19)* 0.31 (0.13)* −2.51 (0.18)* −5.52 (0.35)*
8. Dry mouth and throat 0.73* 0.25 (0.09)# 0.79 (0.05)* 0.78 (0.17)* 2.45 (0.22)* 1.44 (0.17)* −2.07 (0.20)* −6.06 (0.46)*
9. Sweaty palm and planta; distracted feeling 0.69* 0.13 (0.13) 0.88 (0.06)* 0.50 (0.25)# 3.35 (0.52)* 0.16 (0.20)* −3.91 (0.51)* −8.04 (0.98)*
10. Tea-colored urine, reduced urine volume 0.64* 0.22 (0.10)# 0.71 (0.06)* 0.57 (0.16)* 1.82 (0.18)* 0.62 (0.13)* −2.75 (0.20)* −6.70 (0.55)*
  1. SE standard error. λ i : factor i. a i : discrimination parameter of dimension i. d j : easiness parameter of category j of an item
  2. # P <0.05. *P <0.01