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. Author manuscript; available in PMC: 2008 Nov 20.
Published in final edited form as: J Gerontol B Psychol Sci Soc Sci. 2007 Jun;62(SPEC):85–96. doi: 10.1093/geronb/62.special_issue_1.85

Table 6.

Model H (Age as the Only Level 2 Predictor)

Rate of Correct E-Mails Processing Time Navigational Efficiency
Variable Estimate t Estimate t Estimate t
Fixed effects
 Initial status
   Intercept 2.355 24.0*** 2.592 23.8*** 1.065 19.7***
   Age −0.051 −4.2*** 0.056 4.1*** 0.014 2.4*
 Rate of change
   Average .200 10.9*** −0.299 −9 4***
   Age .007 3.1** −0.008 −2.1*
Variance components Wald Z Wald Z Wald Z
 Level 1 residual variance 0.025 7.2*** 0.128 7.2*** 0.087 8.8***
 Level 2 variances
   Initial status 0.482 4.8*** 0.527 4.3*** 0.091 4.0***
   Rate of change 0.012 3.5*** 0.027 2.4*
Pseudo R-square statistics
 R2yy 0.332 0.355 0.228
 R20 0.348 0.267 0.106
 R21 0.192 0.121

Notes: R2yy is the proportion of the variance in the dependent variable explained by the model; R20 is the proportion of the between person variation in initial status explained by the model; R21 is the proportion of the between person variable in rate of change explained by the model.

*

p ≤ .05;

**

p ≤ .01;

***

p ≤ .001.