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Random Error and Systematic Error (Systematic Error (Selection Bias…
Random Error and Systematic Error
Random Error
Systematic Error
Selection Bias
Response Bias
Choice of Controls in Case-Control Study
Population based
Hospital Based
Choice of Cases in Case-Control Study
Cohort studies
Healthy worker effect
Loss to follow up
RCTs
Randomisation
Loss to Follow Up
Information Bias
Misclassification / Measurement Error
Random misclassification
[OR nearer to 1]
Due to poor tools
Non-random misclassification
OR farther form 1
Recall Bias
Observer Bias
How to minimise
Confounding