참고 문헌
Harrell, F. E. (2015). Regression modeling strategies: With applications to linear models, logistic and ordinal regression, and survival analysis (2nd ed). New York, USA: Springer. [Amazon]
Ord, J. K., Fildes, R., & Kourentzes, N. (2017). Principles of business forecasting (2nd ed.). Wessex Press Publishing Co. [Amazon]
Sheather, S. J. (2009). A modern approach to regression with R. New York, USA: Springer. [Amazon]