When Is a Proportional Hazard Model (Cox) Used

question 5

Multiple Choice

When is a proportional hazard model (Cox) used?

• A) When we wish to graph the survival function of our single event data
• B) When we wish to investigate the effect of multiple covariates on the time for a certain event to take place
• C) When we wish to test both time-invariant and time-varying covariates
• D) When we wish to produce the cumulative survivor function

---

Definitions:

Duration Recording

A recording technique that is used for measuring how long behavior lasts. It is most appropriate for behaviors that occur infrequently but continue for some length of time or for behaviors that occur at a high rate so that one episode blends into the next.

Frequency Recording

A method of data collection in behavior analysis that involves counting the number of times a specific behavior occurs within a set period.

Time Sampling

A behavioral observation technique that involves observing the presence or absence of behaviors within specific time intervals.

Frequency

The rate at which an event or behavior occurs over a specified period of time.