Abstract Nonparametric and machine learning methods are flexible for obtaining accurate predictions. Nowadays, data sets with a large number of predictors complex structures fairly common. In the presence item nonresponse, nonparametric procedures may thus provide useful alternative to traditional imputation deriving set imputed values used next estimation study parameters defined as solution p...

We combine the ideas behind trees and Gaussian graphical models to form a new nonparametric family of graphical models. Our approach is to attach nonparanormal “blossoms”, with arbitrary graphs, to a collection of nonparametric trees. The tree edges are chosen to connect variables that most violate joint Gaussianity. The non-tree edges are partitioned into disjoint groups, and assigned to tree ...

A desirable property of one-way functions is that they be total, one-to-one, and onto—in other words, that they be permutations. We prove that one-way permutations exist exactly if PaUP-coUP: This provides the first characterization of the existence of one-way permutations based on a complexity-class separation and shows that their existence is equivalent to a number of previously studied compl...

Animals in a certain population of mice each carry a mutant allele called with probability one-half. This population is bred to a strain of mice which carry the Min allele of the APC gene, an allele which results in the development of intestinal tumors. Offspring from this cross are genotyped for Min and tumor counts are recorded. It is assumed that offspring carrying only Min have tumor counts...

This paper proposes a methodology to examine economies of scope using the recent order-α nonparametric method. It allows us to investigate economies of scope by comparing the efficient order-α frontiers of firms that produce two or more goods with the efficient order-α frontiers of firms that produce only one good. To accomplish this, and because the order-α frontiers are irregular, we suggest ...

Controlling emissions of air pollutants and establishing air quality objectives to improve and protect ambient air quality are very important tasks of Governments. Ozone (O(3)), one of those pollutants of concern, is not emitted directly into the atmosphere, but is a secondary pollutant produced by reaction between nitrogen dioxide (NO(2)), hydrocarbons and sunlight. High levels of ozone can pr...