Bias is defind as?
Spurious association between two variables
A quantified relationship between exposure and disease
Systematic error in determination of association between exposure and disease
Statistical technique used to evaluate the effect of a treatment by comparing treated and non treated
Bias is any systemic error in the determination of the association between exposure and diseases. The relative risk estimate may increase or decrease as a result of the bias. It reflects some type of no compatibility between the study and control groups. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 81
Epidemiology