Sampling Principles, Missingness Mechanisms, and Design Weighting

The schemes of Chap. 2 showed that sample survey data can have some missingness, both intentional missingness and inevitable missingness. Intentional missingness is mostly because of sampling, while inevitable missingness arises from non-responses, ineligibility, undercoverage, and measurement errors. Intentional missingness is, or should be, mostly random, but inevitable missingness is virtually systematic or selective.