Sampling Frame -- The target universe population of corporations
Sample Selection -- How corporations are selected in the sample
Nonresponse -- How data from the sample are adjusted to compensate for sample corporations that do not respond to the survey
Estimation -- How data from the sample are used to compute estimated data for the universe
Sampling Error -- Measuring the variation in the estimate based on the sample
Nonsampling Error -- Variation due to coverage, collection, response, nonresponse, and processing
Seasonal Adjustment -- Accounting for seasonal variations
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