1 Correction to: Ann Inst Stat Math https://doi.org/10.1007/s10463-017-0626-9

Unfortunately, original article has been published without following grant (a FRG grant from Hong Kong Baptist University) information in the Acknowledgements section. The acknowledgement section should be:

Acknowledgements

The authors thank the Editor, the Associate Editor and referees for their constructive comments and suggestions, which led to the substantial improvement in an early manuscript. The research described herewith was supported by the Fundamental Research Funds for the Central Universities, China Postdoctoral Science Foundation (2016M600951), National Natural Science Foundation of China (11701034, 11671042), a Grant from the University Grants Council of Hong Kong and a FRG Grant from Hong Kong Baptist University.