Key points are not available for this paper at this time.
CATS—clustering after transformation and smoothing—is a technique for nonparametrically estimating and clustering a large number of curves. Our motivating example is a genetic microarray experiment, but the method is very general. The method includes transformation and smoothing multiple curves, multiple nonparametric testing for screening out flat curves, clustering curves with similar shape, and nonparametrically inferring the clustering estimation error rate.
Serban et al. (Sun,) studied this question.