Journal article
Calibration of 109Cd KXRF systems for in vivo bone lead measurements: weighted least-squares regression with different weighting functions
Abstract
The use of iteratively reweighted least squares (IRLS) has recently been described as an alternative to ordinary least squares with heteroscedastic data, in the calibration of (109)Cd KXRF systems for in vivo bone lead measurements. This work addresses the use of weighted least squares (WLS) with two different weighting functions and no iteration, with that same data set. The functions are defined as the inverse of the variance of observed …
Authors
de Brito JAA; Chettle DR
Journal
Physics in Medicine and Biology, Vol. 54, No. 13, pp. l45–l50
Publisher
IOP Publishing
Publication Date
July 7, 2009
DOI
10.1088/0031-9155/54/13/l01
ISSN
0031-9155