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Table 5 Descriptive statistics of item and person parameters

From: Developing a computer-based assessment of complex problem solving in Chemistry

Descriptive statistics Item parameters Person parameters
  PUC PR PS SRC SUM PUC PR PS SRC SUM
M 0.00 0.00 0.00 0.00 0.00 −0.45 0.12 −0.47 0.60 −0.04
SD 0.77 1.15 0.89 1.14 0.87 1.11 1.51 1.70 0.95 0.72
Min −0.83 −1.49 −1.37 −1.91 −2.56 −3.17 −3.81 −3.70 −2.14 −2.01
Max 1.14 2.32 1.51 2.77 1.56 3.30 4.01 2.52 3.96 1.89
EAP/PV reliability 0.71 0.65 0.76 0.65 0.83      
N Items 7 7 11 6 31      
  1. SUM, overall problem-solving performance; EAP/PV, expected a posteriori over persons; NItems, number of items. In order to identify the scale, the means of the item parameters were constrained to zero.