@article{ref1,
title="Simpson's paradox : An example using accident data from the state of Texas",
journal="Accident analysis and prevention",
year="1982",
author="Smith, Kersha and O'Day, Joanne",
volume="14",
number="2",
pages="131-133",
abstract="Two-way tabulation of data when a third interacting variable is present can lead to false inferences. In this paper it is shown that the probability of an occupant fatality given a crash in a single-vehicle accident is independent of vehicle size in an aggregate data set. When the data set is partitioned into 2 occupant age groups, it is seen that both of the age groups have higher fatality rates in smaller cars. This is discussed as an example of a paradox presented by Simpson in his 1951 paper.<p />",
language="en",
issn="0001-4575",
doi="",
url="http://dx.doi.org/"
}