Term	Rating Up
Synonym
Related Term
Source of Definition
Short Definition
Statistical Activity	Survey design

Definition
If the achieved sample is rated up, this is an implicit form of imputation. If respondents have different characteristics than non-respondents, non-response bias will be introduced.

Example
We select a sample of 10 from a population of 80. Only 8 of the 10 respond. We 'rate up' by assigning a weight of 10 to each of the respondents (rather than their selection weights of 8). So, if the sample total is 55, the estimate of the population total will be 55*10 = 550.