Bias can be eliminated by all except-
Correct Answer: Multivariate analysis
Description: Bias may arise due to errors of assessment of the outcome due to the human element. 3 sources: subject variation, observer bias, bias in evaluation. Selection bias: cases and controls may not be representative of cases and controls in population. There may be a systemic difference in characteristic between cases and controls. (refer pgno:83 park 23 rd edition)
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