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. Author manuscript; available in PMC: 2011 Jan 1.
Published in final edited form as: Intelligence. 2010 Jan 1;38(1):66–82. doi: 10.1016/j.intell.2009.07.003

Figure 1.

Figure 1

2-Discrete-Factor Model of Digit Span (Levels: 7 for Short-Term Storage (STS), 6 for Additional Control).

Note: Forward-2 thru -9: Lengths 2 thru 9 of Forward Digit Span. Backwar-2 thru -8: Lengths 2 thru 8 of Backward Digit Span. G (5 levels): The General factor of the Verbal, Performance, and Achievement Total summary scores. Loading estimates displayed are the linear approximates (Vermunt & Magidson, 2005a) of the model slope parameter estimates that indicate the strength of the relationship between the latent traits and the specific task items in the style of the traditional factor analysis. All listed loading estimates are significant at p<0.05. The dashed lines indicate the elements to be included in the extended model.