1. Discuss common sources of error in epidemiologic research, and how to avoid/reduce these sources of error.Your response must be at least 200-400 words in length.2. What is meant by an absolute effect in epidemiologic research? Present at least one relevant example.Your response must be at least 200-400 words in length.3. Discuss validity of study design in epidemiologic research, and how to best ensure a valid design.Your response must be at least 200-400 words in length.4. Discuss key statistical measures of effect in epidemiologic research, briefly explaining the use of each measure.Your response must be at least 200-400 words in length.Pages 409-433 in chapter 9 and pages 435-458 in chapter 10

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