An example of a "certification mark" would be:

One insured status under OASDI requires at least six quarters of coverage out of the last 13 quarters ending with the quarter of death, disability, or entitlement to old-age benefits. This insured status is:

a) Disability insured b) Currently insured c) Medicate insured d) Fully insured

A major strength of scanner data is its representativeness gained by including all retail categories, such as food warehouses and mass merchandisers

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