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Question 1
What do you want to find out?
Whether an outcome differs between groups
e.g. HbA1c in treated vs control
How strongly two numeric measurements move together
e.g. BMI and blood pressure
An association adjusted for confounders, or a prediction model
e.g. smoking and MI, adjusted for age and sex
How long until an event happens
death, relapse, discharge; some patients censored
Whether two methods or observers agree
new device vs gold standard, two raters
How well a diagnostic or screening test performs
sensitivity, specificity, cut-offs
How patients change over several visits
same patients measured repeatedly