You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Bias is defind as? and explain in detail?
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