1 Introduction  
2 Time-Varying Contextual Factors  
2.1 Definitions  
2.2 Literature Review  
2.3 Research Proposal  
3 Research Aims  
4 Data  
4.1 The Dutch Health Surveys  
4.2 Weather Data  
4.3 Societal/Google Trends  
4.4 Overview of Variables  
5 Methods  
5.1 Discrete-Time Survival Analysis  
5.2 The General Modelling Approach  
5.3 Model Specification  
5.4 Lasso Regularization  
5.5 Model Evaluation  
5.6 Variable Importance  
5.7 Software  
6 Results  
6.1 Model Estimates and Interpretation  
6.2 Model Performance  
6.3 Variable Importance  
7 Discussion & Conclusion  
7.1 Effects of Time-Varying Contextual Predictors  
7.2 Model Prediction  
7.3 Variable Predictive Performance  
7.4 Implication for Survey Data Collection  
7.5 Implication for Survey Methodological Research  
7.6 Limitations and Future Direction