 The dataset is composed of several periods, and we develop a PU learning algorithm for efficient training, using the dataset with the time series. Through empirical analysis , we interpret the classification results from the viewpoint of economics .
<coherence>  The dataset is composed of several periods, and we develop a PU learning algorithm for efficient training, using the dataset with the time series. Through empirical analysis , we interpret the classification results from the viewpoint of economics .
 The dataset is composed of several periods, we interpret the classification results from the viewpoint of economics .