Velleman and Hoaglin (1981) describe the nonparametric smoother 4253H,Twice which uses a combination of running medians and Hanning to smooth data sequences. Velleman and Hoaglin (1981) suggest that the minimum sample size recommended for this nonparametric smoother is seven. A proof and working...

. This paper explores the adoption of a probabilistic nonparametric estimator in economics. First, it satisfies the probabilistic coherence principle, which ensures that the estimated variable can be generated by probabilistic assignment modeling from the observed variable. Second, it is proved...