An IPW estimator for mediation effects in hazard models: with an application to schooling, cognitive ability and mortality

Govert E. Bijwaard, Andrew M. Jones

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Large differences in mortality rates across those with different levels of education are a well-established fact. Cognitive ability may be affected by education so that it becomes a mediating factor in the causal chain. In this paper, we estimate the impact of education on mortality using inverse-probability-weighted (IPW) estimators. We develop an IPW estimator to analyse the mediating effect in the context of survival models. Our estimates are based on administrative data, on men born between 1944 and 1947 who were examined for military service in the Netherlands between 1961 and 1965, linked to national death records. For these men, we distinguish four education levels and we make pairwise comparisons. The results show that levels of education have hardly any impact on the mortality rate. Using the mediation method, we only find a significant effect of education on mortality running through cognitive ability, for the lowest education group that amounts to a 15% reduction in the mortality rate. For the highest education group, we find a significant effect of education on mortality through other pathways of 12%.

Original languageEnglish
Pages (from-to)129-175
Number of pages47
JournalEmpirical Economics
Volume57
Issue number1
DOIs
Publication statusPublished - Jul 2019
Externally publishedYes

Keywords

  • Education
  • Inverse probability weighting
  • Mediators
  • Mixed proportional hazard
  • Mortality

Cite this

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title = "An IPW estimator for mediation effects in hazard models: with an application to schooling, cognitive ability and mortality",
abstract = "Large differences in mortality rates across those with different levels of education are a well-established fact. Cognitive ability may be affected by education so that it becomes a mediating factor in the causal chain. In this paper, we estimate the impact of education on mortality using inverse-probability-weighted (IPW) estimators. We develop an IPW estimator to analyse the mediating effect in the context of survival models. Our estimates are based on administrative data, on men born between 1944 and 1947 who were examined for military service in the Netherlands between 1961 and 1965, linked to national death records. For these men, we distinguish four education levels and we make pairwise comparisons. The results show that levels of education have hardly any impact on the mortality rate. Using the mediation method, we only find a significant effect of education on mortality running through cognitive ability, for the lowest education group that amounts to a 15{\%} reduction in the mortality rate. For the highest education group, we find a significant effect of education on mortality through other pathways of 12{\%}.",
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An IPW estimator for mediation effects in hazard models : with an application to schooling, cognitive ability and mortality. / Bijwaard, Govert E.; Jones, Andrew M.

In: Empirical Economics, Vol. 57, No. 1, 07.2019, p. 129-175.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

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T2 - with an application to schooling, cognitive ability and mortality

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AU - Jones, Andrew M.

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AB - Large differences in mortality rates across those with different levels of education are a well-established fact. Cognitive ability may be affected by education so that it becomes a mediating factor in the causal chain. In this paper, we estimate the impact of education on mortality using inverse-probability-weighted (IPW) estimators. We develop an IPW estimator to analyse the mediating effect in the context of survival models. Our estimates are based on administrative data, on men born between 1944 and 1947 who were examined for military service in the Netherlands between 1961 and 1965, linked to national death records. For these men, we distinguish four education levels and we make pairwise comparisons. The results show that levels of education have hardly any impact on the mortality rate. Using the mediation method, we only find a significant effect of education on mortality running through cognitive ability, for the lowest education group that amounts to a 15% reduction in the mortality rate. For the highest education group, we find a significant effect of education on mortality through other pathways of 12%.

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