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Survival Analysis: Exploding BBQs and Hazard Functions

Explore an experiment to test BBQ explosion rates and analyze the data using hazard functions. Learn how to identify and analyze the chances of the BBQs exploding and the significance of event data in survival analysis.

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Survival Analysis: Exploding BBQs and Hazard Functions

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Presentation Transcript

  1. Survival analysis And the legend of the exploding barbeque…..

  2. The problem • Barbeques, while tasty, use gas bottles. • From time to time, and with no warning, these bottles randomly explode. • This tends to put a dampner on parties.

  3. The problem • How to design an experiment to test the exploda-bility of 2 BBQs? • Could get 20 of each BBQ, use them for 40 days, look at number of days till explosion. • How do we analyse these data? • What about ones that didn’t explode?

  4. The problem • We could just remove the data that didn’t explode • But they’re an important part of the analysis • Need to instead work out a hazard function, the chance of each BBQ type exploding on each day. • E.g. we go back to our data, and find the Red Neck Roaster has a 1% chance of exploding per day • For The T-Bone terminator, it’s 0.1%

  5. Results.. Redneck roaster T-Bone Terminator

  6. Survival analysis • Hazard function forms the basis of survival analysis • Used for any “time to event” data Everything eventually dies/fails Looking for differences in rate

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