Week 4 Flashcards
What is the goal of epidemiology and health research
Identification of causes and prevetions for disease
What is strong evidence
The lowest possible random sampling error
Based on a good design
What is internal validity
Do the observed results accurately reflect the true association
What is generalizability external validity
Who can this be applied to you need internal validity
Can it be applied to another population
What is validity
Havin fewer errors
Error=Measured value- True value
What are the three threats to validity
Chance
Bias
Confounding
What is Random sampling error
The samples wont be the same nothing is wrong with sample you just arent going to get the same answer twice
Type 1 and Type 2 error
What is Bias
A systematic error in the design or conduct of the study the observed association between the exposure and outcome will be different from the true association
Is the information we obtain bias because of errors in measurment
Yes
What is information bias
It occures if the collected information from or about study particpants are wrong interview,recall, observer, respondent
What are the threats of information bias
People are misclassified
What is selection Bias
A systematic error in the way participants are selected or retained in a study
Why dose selection bias happen
How we recruit participants into our studies
How we approach people how we invite them whether they decide to be a part
Not issues related to sampling
What are the three types of selection bias
Inappropriate control selection
Differential participation
Differential Loss to follow up
What is voulnteer bias
Voulnteer are more health conscious from a different socio economic group
