
295Model Development and Interpretation
Ideally, the value of both sensitivity and specicity should be as high as possible. Low
value of sensitivity species that there are many high-risk classes (positive classes)
that are incorrectly classied as low-risk classes. Low value of specicity species
that there are many low-risk classes (negative classes) that are incorrectly classied as
high-risk classes (Aggarwal et al. 2009). For example, consider a two-class problem in
a software organization where a module may be faulty or not faulty. In this case, low
sensitivity would result in delivery of software with faulty modules to the customer