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PC program for assessing the relationship between rate of change and initial value

✍ Scribed by Charles J. Kowalski; Emet D. Schneiderman; Stephen M. Willis

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
680 KB
Volume
24
Category
Article
ISSN
0010-4825

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✦ Synopsis

menu-driven PC program implementing Blomqvist'a [J. Am. Sfuf. Assn. 72. 746-740, 19773 method for assessing the relationship between rate of change and initial value is described, illustrated and made available. It is shown that the naive approach to this problemcomputing the correlation between the initial value and either the amount or rate of changeresults in a negatively biased estimator. The extent of this bias can be dramatic and may lead investigators to conclude that a negative correlation is present when none exists; or that there is no correlation when in fact the correlation is positive. Blomqvist's (maximum likelihood) estimator avoids this bias, and is obtained by a transformation of the naive estimator. Growth rates Change Initial value Biased estimator PC program

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