Person reliability

Person reliability is equivalent to the traditional test reliability, which indicates how likely we will be able to get the same ordering of individuals using a repeated test.
試題反應理論中針對個案能力所驗證的信度，相當於傳統的測驗信度，指的是：重複相同的測驗可以得到相同的個案能力排序的可能性(穩定性)。

Reference:
Li, J., Liu, H., Feng, T., & Cai, Y. (2011). Psychometric assessment of HIV/STI sexual risk scale among MSM: A Rasch model approach. BMC Public Health, 11, 763.

Criteria: A minimum value of 0.7 is required for group use and 0.85 for individual use.
用於團體比較的標準：0.7；用於個人比較的標準：0.85。

Reference:
Tennant, A., & Conaghan, P. G. (2007). The Rasch measurement model in rheumatology: what is it and why use it? When should it be applied, and what should one look for in a Rasch paper? Arthritis Rheum, 57(8), 1358-1362.

Research design: 以新發展的評估工具評估一群個案(如:200人)，以每位(團體)個案所得(平均)分數變異誤(標準誤的平方)的反比來獲得評估工具對個別(團體)個案能力估計的信度。
註:person reliability可分為團體層級和個別層級。

Model paper:
Hou, W. H., Chen, J. H., Wang, Y. H., Wang, C. H., Lin, J. H., Hsueh, I. P., Hsieh, C. L. (2011). Development of a set of functional hierarchical balance short forms for patients with stroke. Arch Phys Med Rehabil, 92(7), 1119-1125.

臨床意義：Person reliability可幫助我們得知所使用的評估工具是否具有估計不同個案能力的穩定性(精準度)。