Half-Open Interval

The half-open interval is a linking procedure that is used in some surveys to address issues of noncoverage. Sampling frames or lists are not perfect, and survey researchers often use frames with problems such as missing elementary units, blanks for relevant information, clusters of elementary units, and duplicate listings. Of these problems, sample frames that are missing elementary units—known as noncoverage—frequently present important practical problems. For example, housing lists incorporating addresses are often used in household surveys. The housing list is often out of date, and when an interviewer visits the housing unit selected from the list, there can be newly constructed housing units that were not on the original list used for sampling. When there is noncoverage of the target population due to an ...