Exam 5 Flashcards
1
Q
When the outcome of interest in a study concerns the occurance and the timing of an event (time to event outcome) what statistical method is used?
A
Survival Analysis
2
Q
When does data censoring occur?
A
- When the survival data isnt complete and not all of it is known.
3
Q
What does the survival curve for the Kaplan meier method estimate?
A
- Summarizes the probability of survival over time given estimated from a sample
4
Q
What is Hazard?
A
The risk of an event occuring at time (t)
5
Q
For a Cox regression what does B=0 mean? What about B>0 or <0?
A
- =0 no effect
- Increase in predictor causes an increase in hazard and a decrease in survival
- Opposite
6
Q
How are B coefficients estimates in a cox proportion?
A
Using Maximum Partial Likelihood
7
Q
Which test can be used to find an Odds Ration using e^B?
A
Logistic regression
8
Q
When test can be used to find a hazard ratio e^B?
A
Cox proportion regression
9
Q
What 5 things does sample size need to be balanced with?
A
