Explain the difference between validity and reliability. Explain NHANES and BRFSS.

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Expert Solution

The difference between validity and reliability is that validity refers to how well a test measures what it is purported to measure. While reliably is necessary it alone is not sufficient. For a test to be reliable it's needs to be valid.

Validity of measuring instrument represent the degree to which the scale measures what it is expected to measure. Reliability refers to the degree to which measurements produces consistent outcome.

NHANES - national health and nutrition examination survey. It is a program of studies designed to access the health and nutritional status of adults and children in US. It is unique since it combines bothinterviews and physical examination.

BRFSS - Behavioral risk factor survelliance system. It is a uS health survey that looks at behavioral risk factor. This is run by centers for disease control and prevention and conducted by individual state health department.

gladiator answered 1 year ago

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