A generalised Box-Cox transformation for the parametric estimation of clinical reference intervals

Gillard, Jonathan William ORCID: https://orcid.org/0000-0001-9166-298X 2012. A generalised Box-Cox transformation for the parametric estimation of clinical reference intervals. Journal of Applied Statistics 39 (10) , pp. 2231-2245. 10.1080/02664763.2012.706266

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Abstract

Parametric methods for the calculation of reference intervals in clinical studies often rely on the identification of a suitable transformation so that the transformed data can be assumed to be drawn from a Gaussian distribution. In this paper, the two-stage transformation recommended by the International Federation for Clinical Chemistry is compared with a novel generalised Box–Cox family of transformations. Investigation is also made of sample sizes needed to achieve certain criteria of reliability in the calculated reference interval. Simulations are used to show that the generalised Box–Cox family achieves a lower bias than the two-stage transformation. It was found that there is a possibility that the two-stage transformation will result in percentile estimates that cannot be back-transformed to obtain the required reference intervals, a difficulty not observed when using the generalised Box–Cox family introduced in this paper.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Mathematics
Subjects:	Q Science > QA Mathematics
Uncontrolled Keywords:	Box–Cox family; transformations; reference intervals
Publisher:	Taylor & Francis
ISSN:	0266-4763
Last Modified:	20 Oct 2022 09:48
URI:	https://orca.cardiff.ac.uk/id/eprint/33153

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