Flashcards in Week 141 - Measurements in populations II Deck (7):
What is chance?
The occurrence of an event based on probability
What is selection bias?
The selection of controls that are not representative of the population
What is information bias?
i.e. asking a person what they ate at a certain event
- people will recall information to a different accuracy
What is a confounding variable?
A variable that can cause or be associated with the disease and is also linked the the exposure of interest
i.e. a study between alcohol intake and IHD
- those who drink alcohol are more likely to smoke, and smoking has an association with IHD
What is residual confounding and how can this be dealth with?
When all confounding factors have been accounted for but there remain unknown confounders
Can be dealth with by randomisation
What is standardisation ad what types are there?
A technique used to remove the effects of differences in confounders (i.e. age) when comparing two or more populations