Optimizing Reliability of Digital Inclinometer and Flexicurve Ruler Measures of Spine Curvatures in Postmenopausal Women with Osteoporosis of the Spine: An Illustration of the Use of Generalizability Theory

Table 1

Comparison of differences between classical test theory and generalizability theory.

Classical test theory	Generalizability theory
True score	Universe of admissible observations’ score
One identifiable source of “error” variance	Multiple sources of identifiable “error” variances
One-way ANOVA	Factorial ANOVA
“What if” optimizing assessment method: Spearman Brown	“What if” optimizing assessment method: design study