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. Author manuscript; available in PMC: 2009 Jul 9.
Published in final edited form as: Mech Ageing Dev. 2008 Mar 25;130(1-2):98–104. doi: 10.1016/j.mad.2008.03.006

Fig. 4.

Fig. 4

Examples of positive and negative correlations between frailties (Z) and between life spans (LS) in the bivariate lognormal frailty model with different frailty distributions.