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Questions and Answers
What is the required format for structuring data with time-varying covariates in the Cox PH model?
What is the required format for structuring data with time-varying covariates in the Cox PH model?
- Random time format
- Start-stop time format (correct)
- Event-driven time format
- Continuous time format
How many time variables are required to record the beginning and end of time intervals for time-varying covariates?
How many time variables are required to record the beginning and end of time intervals for time-varying covariates?
- 1
- 3
- 4
- 2 (correct)
When should the time when a covariate changes value be recorded?
When should the time when a covariate changes value be recorded?
- At any random time point
- As the end of the previous interval
- As the beginning of a new interval (correct)
- It doesn't need to be recorded
Which function in the survival package helps to get data in the required start-stop time format for time-varying covariates?
Which function in the survival package helps to get data in the required start-stop time format for time-varying covariates?
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In the jasal dataset, what is considered as a time-varying covariate?
In the jasal dataset, what is considered as a time-varying covariate?
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What does the 'status' variable record in the Cox PH model for single event data?
What does the 'status' variable record in the Cox PH model for single event data?
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