@article{ref1,
title="Nonparametric analysis of dose-response relations in epidemiology",
journal="Mathematical modelling",
year="1986",
author="Ulm, K.",
volume="7",
number="5-8",
pages="777-783",
abstract="A nonparametric method for the estimation of a dose-response relation is described. Up to two quantitative covariates can be handled. Subject only to the constraints of monotonicity an estimation procedure together with an approach for testing the association is described. An application to data of an epidemiological study is presented.<p />",
language="",
issn="0270-0255",
doi="10.1016/0270-0255(86)90133-8",
url="http://dx.doi.org/10.1016/0270-0255(86)90133-8"
}