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Superconsistent estimation of points of impact in non‐parametric regression with functional predictors
Author(s) -
Poß Dominik,
Liebl Dominik,
Kneip Alois,
Eisenbarth Hedwig,
Wager Tor D.,
Barrett Lisa Feldman
Publication year - 2020
Publication title -
journal of the royal statistical society: series b (statistical methodology)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.523
H-Index - 137
eISSN - 1467-9868
pISSN - 1369-7412
DOI - 10.1111/rssb.12386
Subject(s) - estimator , parametric statistics , outcome (game theory) , estimation , rate of convergence , regression analysis , parametric model , mathematics , scalar (mathematics) , convergence (economics) , computer science , regression , multilevel model , econometrics , statistics , engineering , computer network , channel (broadcasting) , geometry , mathematical economics , systems engineering , economics , economic growth
Summary Predicting scalar outcomes by using functional predictors is a classical problem in functional data analysis. In many applications, however, only specific locations or time points of the functional predictors have an influence on the outcome. Such ‘points of impact’ are typically unknown and must be estimated in addition to estimating the usual model components. We show that our points‐of‐impact estimator enjoys a superconsistent rate of convergence and does not require knowledge or pre‐estimates of the unknown model components. This remarkable result facilitates the subsequent estimation of the remaining model components as shown in the theoretical part, where we consider the case of non‐parametric models and the practically relevant case of generalized linear models. The finite sample properties of our estimators are assessed by means of a simulation study. Our methodology is motivated by data from a psychological experiment in which the participants were asked to rate their emotional state continuously while watching an affective video eliciting a varying intensity of emotional reactions.