Research on Audit Opinion Prediction of Listed Companies Based on Sparse Principal Component Analysis and Kernel Fuzzy Clustering Algorithm

Table 2

Sample distribution of the dataset.

Datasets	Year of the training sample	Number of training samples	Year of the test sample	Number of test samples
Dataset I	2012–2015	5510	2016	138
Dataset II	2012–2016	7404	2017	142
Dataset III	2012–2017	9583	2018	256
Dataset IV	2012–2018	11825	2019	310