About the Authors

William Michael Landau

landau@iastate.edu

Affiliation Department of Statistics, Iowa State University, Ames, Iowa, United States of America

Peng Liu

Affiliation Department of Statistics, Iowa State University, Ames, Iowa, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: WML PL. Performed the experiments: WML. Analyzed the data: WML PL. Contributed reagents/materials/analysis tools: WML. Wrote the paper: WML PL.