適合度（參見英文：goodness of fit）係泛指手上嘅統計模型有幾合乎觀察到嘅數據。簡單嚟講，唔同嘅適合度指標計法不盡相同，但都係喺度評估手上個模型，解釋數據嘅能力有幾好。適合度指標可以幫助研究者判斷分析得出嘅模型，係咪合適用於特定數據之上。
亦都方便比較唔同模型嘅表現。常見嘅適合度評估方法包括決定係數等[1]，而且研究者仲可以分析殘差。
喺結構方程模型中，會用卡方檢定比較協方差矩陣，從而評估適合度。[2][3]
- ↑Casella, Georges (2002).Statistical inference (第Second版). Pacific Grove, Calif.: Duxbury/Thomson Learning. p. 556.ISBN 9788131503942.
- ↑Study on the factors affecting customer purchase activity in retail stores by confirmatory factor analysis.
- ↑Chen, F., Curran, P. J., Bollen, K. A., Kirby, J., & Paxton, P. (2008). An empirical evaluation of the use of fixed cutoff points in RMSEA test statistic in structural equation models.Sociological methods & research, 36(4), 462-494.
