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. Author manuscript; available in PMC: 2009 Sep 22.
Published in final edited form as: Biometrics. 2001 Dec;57(4):1173–1184. doi: 10.1111/j.0006-341x.2001.01173.x

Table 6.

Estimates, standard errors, and the ratios of the estimate to the standard error for the regression coefficients corresponding to the interaction of age and the first (age × B1) and ninth (age × B9) spline bases functions under three covariance structure models. AR(1), AR(1) structured estimator; unstruc, unstructured estimator; struc log, structured log eigenvalue shrinkage estimator.

AR(1) Unstruc Struc log
Age × B1 .0097 (.0029) .0045 (.0024) .0063 (.0020)
Ratio 3.30 1.87 3.10
Age × B9 .0164 (.0128) .0131 (.0034) .0131 (.0043)
Ratio 1.28 3.83 3.02