Suhada, A., Syafriandi, D. Vionanda, and F. Fitri. “Modeling Open Unemployment Rate in West Sumatera Province Using Truncated Spline Regression”. 2022. UNP Journal of Statistics and Data Science, vol. 1, no. 1, Feb. 2023, pp. 39-44, doi:10.24036/ujsds/vol1-iss1/3.