References
- 1. Blundell, R., Chen, X. K. (2007). Semi-Nonparametric IV Estimation of Shape- Invariant Engel Curves. Econometrica, Vol. 75, No. 6 , pp. 1613-1669.
- 2. Breiman, L., Friedman, J. H., Olshen, R. A., Stone, C. J. (1984). Classification and regression trees. Wadsworth and Books/Cole, Belmont, CA.
- 3. de Boor, C. (1972). On calculating with B-splines. J. Approx. Theory, 6 , pp 50-62.
- 4. Friedman, J. H. (1991). Multivariate Adaptive Regression Splines. The Annals of Statistics, Vol. 19, No. 1 , pp. 1-67.
- 5. Geambasu, L., Jianu, I., Geambasu, C. (2010). Spline linear regression used for evaluating financial assets. Analele Universitaţii “Constantin Brâncusi” din Târgu Jiu, Seria Economie, Nr. 4/2010 , pp. 310-321.
- 6. Greiner, A. (2009). Estimating penalized spline regressions: theory and application to economics. Applied Economics Letters, 16 , pp. 1831-1835.
- 7. Haupt, H., Kagerer, K., Steiner, W. (2014). Smooth quantile bases modeling of brand sales, price and promotional effects from retail scanner panels. Journal of Applied Econometrics, DOI 10.1016/j.jeconom.2014.06.003.
- 8. Liu, R., Yang, L. (2010). Spline-backfitted kernel smoothing of additive coefficient model. Econometric Theory 26 , pp. 29-59.
- 9. Ma, S., Racine, J., Yang, L. (2015). Spline regression in the presence of categorical predictors. J. Appl. Econ. 30 , pp. 705-717.
- 10. Morgan, J. N., Sonquist, J. A. (1963). Problems in the analysis of survey data, and a proposal. J. Amer. Statist. Assoc. 58 , pp. 415-434.
- 11. National Institute of Statistics. (2011). Unemployment BIM methodology on a monthly basis. Retrieved from www.insse.ro: www.insse.ro/.../Metodologia_rata%20somaj%20BIM%20lunar_rev.doc. Accessed 6 April 2016.
- 12. Paradis, E. (2013). R for beginners. Retrieved from https://cran.rproject.org/doc/contrib/Paradis-rdebuts_en.pd. Accessed 6 Aplir 2016.
- 13. Cambridge Series in Statistical and Probabilistic Mathematics, volume 12, Cambridge University Press.
- 14. Ruppert, D., Wand, M., Carroll, R. (2003). Semiparametric regression. New York: Cambridge University Press.
- 15. Sunil, R. (2015). 7 tipes of regression techniques you should know! Retrieved from Analytics Vidhya: http://www.analyticsvidhya.com/blog/2015/08/comprehensive-guideregression/. Accesed 12 April 2016.
- 16. Vlad, C., Brezeanu P., Fiscality - a relevant factor influencing regional development in Romania and the European Union, Studia Universitatis “Vasile Goldis” Arad Economics Series, Vol. 26, Issue 2/2016, pp 48-62.
- 17. Wu, W. (2009). An application of spline regression to dose-response analysis in observational study. Retrieved from https://medschool.vanderbilt.edu/cqs/files/cqs/media/2009Jan16William.pdf. Nashville - Vanderbilt University Medical School, USA. Accesed 13 April 2016.