However, this variable was highly significant in the Cox frailty model which reiterates the importance of simultaneous correction of both parameter estimates and the standard error when analyzing correlated observations.
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Determinants of Under-Five Mortality in Rural Empowered Action Group States in India: An Application of Cox Frailty Model.
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The sentences
To account for this correlation, if we correct the standard error alone, it might lead to the biased inference, casting doubt especially on the more marginally significant results.