The hidden effect of time
- 1 June 1988
- journal article
- research article
- Published by Wiley in Statistics in Medicine
- Vol. 7 (6), 629-637
- https://doi.org/10.1002/sim.4780070602
Abstract
It is customary to regard datasets as homogeneous with respect to the order of collection of the measurements. Examples are given in which this assumption is breached. Hidden time trends have implications for the design of studies, their analysis and interpretation. It is suggested that, if the order of observations is known, a plot by time should be performed, perhaps using a cusum.Keywords
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