scholarly journals Reassessing Schoenfeld Residual Tests of Proportional Hazards in Political Science Event History Analyses

2015 ◽  
Vol 59 (4) ◽  
pp. 1072-1087 ◽  
Author(s):  
Sunhee Park ◽  
David J. Hendry
Keyword(s):  
Political Science ◽  
Proportional Hazards ◽  
Event History

Time is of the Essence: Event History Models in Political Science

1997 ◽  
Vol 41 (4) ◽  
pp. 1414 ◽  
Author(s):  
Janet M. Box-Steffensmeier ◽  
Bradford S. Jones
Keyword(s):  
Political Science ◽  
Event History

Duration Models and Proportional Hazards in Political Science

2001 ◽  
Vol 45 (4) ◽  
pp. 972 ◽  
Author(s):  
Janet M. Box-Steffensmeier ◽  
Christopher J. W. Zorn
Keyword(s):  
Political Science ◽  
Proportional Hazards ◽  
Duration Models

Event Dependence and Heterogeneity in Duration Models: The Conditional Frailty Model

2007 ◽  
Vol 15 (3) ◽  
pp. 237-256 ◽  
Author(s):  
Janet M. Box-Steffensmeier ◽  
Suzanna De Boef ◽  
Kyle A. Joyce
Keyword(s):  
Political Science ◽  
State Policy ◽  
Frailty Model ◽  
Event History ◽  
Duration Models ◽  
Terrorist Attacks ◽  
Repeated Events ◽  
Event Dependence ◽  
State Policy Adoption ◽  
Event Times

We introduce the conditional frailty model, an event history model that separates and accounts for both event dependence and heterogeneity in repeated events processes. Event dependence and heterogeneity create within-subject correlation in event times thereby violating the assumptions of standard event history models. Simulations show the advantage of the conditional frailty model. Specifically they demonstrate the model's ability to disentangle the sources of within-subject correlation as well as the gains in both efficiency and bias of the model when compared to the widely used alternatives, which often produce conflicting conclusions. Two substantive political science problems illustrate the usefulness and interpretation of the model: state policy adoption and terrorist attacks.

Beyond the Hazard Ratio: Generating Expected Durations from the Cox Proportional Hazards Model

2017 ◽  
Vol 50 (1) ◽  
pp. 303-320 ◽  
Author(s):  
Jonathan Kropko ◽  
Jeffrey J. Harden
Keyword(s):  
Political Science ◽  
Hazard Function ◽  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Cox Model ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Model ◽  
Hazards Model ◽  
Hazard Ratios ◽  
Quantities Of Interest

The Cox proportional hazards model is a commonly used method for duration analysis in political science. Typical quantities of interest used to communicate results come from the hazard function (for example, hazard ratios or percentage changes in the hazard rate). These quantities are substantively vague, difficult for many audiences to understand and incongruent with researchers’ substantive focus on duration. We propose methods for computing expected durations and marginal changes in duration for a specified change in a covariate from the Cox model. These duration-based quantities closely match researchers’ theoretical interests and are easily understood by most readers. We demonstrate the substantive improvements in interpretation of Cox model results afforded by the methods with reanalyses of articles from three subfields of political science.

FACTORS INFLUENCING UNION FORMATION IN NAIROBI, KENYA

2009 ◽  
Vol 41 (4) ◽  
pp. 433-455 ◽  
Author(s):  
PHILIPPE BOCQUIER ◽  
ANNE KHASAKHALA
Keyword(s):  
Proportional Hazards ◽  
Cox Proportional Hazards ◽  
Event History ◽  
Union Formation ◽  
Search Model ◽  
Men And Women ◽  
Proportional Hazards Regression ◽  
Factors Influencing ◽  
Age Cohort ◽  
Exogenous Factors

SummaryUsing retrospective data from the Urban Integration Survey conducted in 2001 in Nairobi, Kenya, on a sample of 955 women and men aged 25–54, this paper compares factors influencing entry into union formation for men and women. The analysis uses event history methods, specifically Cox Proportional Hazards regression, stratified by age cohort and run separately by sex. The results indicate that delay in union formation is more pronounced for women than for men. Cohabitation without formal marriage is the prominent form of union, especially among the younger generation, and appears to have increased. For men, the timing of union is more dependent upon human capital acquisition than on cultural factors. These findings show that the marriage search model, which was first applied in Western countries, can also hold in cities of developing countries. Nonetheless, neither the search model nor the integration or the independence models apply to women's union formation, which very few exogenous factors can explain.

Event History Analysis in Demography

1995 ◽  
Vol 49 (2) ◽  
pp. 355-357
Author(s):  
Johannes Huinink
Keyword(s):  
Event History Analysis ◽  
Event History ◽  
History Analysis
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