1 Correction to: Ann Inst Stat Math https://doi.org/10.1007/s10463-019-00745-z

In the original article, the affiliations were published incorrectly. The authors apologize for any inconvenience that it may have caused. The affiliations of the authors should be as follows

Quynh Van Nong

Department of Mathematics, Thai Nguyen University of Education, Luong Ngoc Quyen Street, Thai Nguyen City, Vietnam.

E-mail: quynhvandhsp@gmail.com

Chi Tim Ng (Corresponding author)

Department of Mathematics, Statistics, and Insurance, Hang Seng University of Hong Kong Hang Shin Link, Siu Lek Yuen, Shatin, N.T., Hong Kong.

E-mail: easterlyng@gmail.com