Table of Contents Author Guidelines Submit a Manuscript
Shock and Vibration
Volume 1, Issue 4, Pages 303-316

Two Visually Meaningful Correlation Measures for Comparing Calculated and Measured Response Histories

Benjamin Whang, William E. Gilbert, and Stephen Zilliacus

Carderock Division, Naval Surface Warfare Center, Bethesda, MD 20084, USA

Received 22 November 1993; Accepted 13 January 1994

Copyright © 1994 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Two visually meaningful correlation measures are proposed for comparing calculated and measured response histories. One is an error index which is a simplification of RSS (root-sum-square) error factor, and the other is an inequality index that is a simplification of Theil’s inequality coefficient. The first compares the difference between the calculated and the measured histories to the measured history. The second compares the difference between the two histories to the sum of the two. The proposed correlation measures are compared to other existing measures, namely, Geers’ Error Factors, RSS Error Factor, and Theil's Inequality Coefficient for ease of interpretation and visualization.