The modern sample survey evolved from the Victorian social survey movement, which assembled facts about urban poverty. Other sources were the development of the statistical theory of probability, and the early attempts to carry out straw polls before...

A sample in which the proportion of each category is the same as the proportion in the total...

Sampling is that part of statistical practice concerned with the selection of individual observations intended to yield some knowledge about a population of concern, especially for the purposes of statistical inference. Each observation measures one or...