GTRACK: a PC program for computing Goldstein's growth constancy index and an alternative measure of tracking. Academic Article uri icon


  • This paper reviews Goldstein's 'growth constancy index,' Xi, a measure of tracking which can be used to determine whether or not individuals maintain their relative positions in the distribution of a given measurement as that distribution changes over time. We suggest that Xi is an appropriate measure of tracking when the (standardized) measurements arise in the context of a Model I ANOVA, but that the intraclass correlation coefficient, rI, may be preferred when a Model II ANOVA is applicable. We also describe--and make available--a PC program which allows the user to choose between Model I and Model II, and computes the appropriate tracking index and confidence intervals for the corresponding parameter.

published proceedings

  • Int J Biomed Comput

author list (cited authors)

  • Furey, A. M., Kowalski, C. J., Schneiderman, E. D., & Willis, S. M.

citation count

  • 4

complete list of authors

  • Furey, AM||Kowalski, CJ||Schneiderman, ED||Willis, SM

publication date

  • January 1994