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Comments on "The confounding effect of class size on the validity of object-oriented metrics"

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1 Author(s)
Evanco, W.M. ; Coll. of Inf. Sci. & Technol., Drexel Univ., Philadelphia, PA, USA

It has been proposed by El Emam et al. (ibid. vol.27 (7), 2001) that size should be taken into account as a confounding variable when validating object-oriented metrics. We take issue with this perspective since the ability to measure size does not temporally precede the ability to measure many of the object-oriented metrics that have been proposed. Hence, the condition that a confounding variable must occur causally prior to another explanatory variable is not met. In addition, when specifying multivariate models of defects that incorporate object-oriented metrics, entering size as an explanatory variable may result in misspecified models that lack internal consistency. Examples are given where this misspecification occurs.

Published in:

Software Engineering, IEEE Transactions on  (Volume:29 ,  Issue: 7 )

Date of Publication:

July 2003

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