Accuracy Evaluation of A Diagnostic Test by Detecting Outliers and Influential Observations

作者：Yang Hsien Chueh Peter; Chen Tsung Hao^*; Chen Cheng Wu; Chen Chen Yuan; Liu Chun Te

来源：China Ocean Engineering, 2008, 22(3): 421-429.

• diagnostic testing
• outliers
• influential observations
• internal solitary wave

Logit regression analysis is widely applied in scientific studies and laboratory experiments, where skewed observations on a data set are often encountered. A number of problems with this method, for example, outliers and influential observations, can cause overdispersion when a model is fitted. In this study a systematic statistical approach, including the plotting of several indices is used to diagnose the lack-of-fit of a logistic regression model. The outliers and influential observations on data from laboratory experiments are then detected. Specifically we take account of the interaction of an internal solitary wave (ISW) with an obstacle, i.e., an underwater ridge, and also analyze the effects of the ridge heights, the lower layer water depth, and the potential energy on the amplitude-based transmission rate of the ISW. As concluded, the goodness-of-fit of the revised logit regression model is better than that of the model without this approach.

• 出版日期2008