A sample drawn in several phases refers to selectîon of a large-sized preliminary sample ın whiclı some quick and inexpensive metlıod of measurement is applied. A subsample is drawn and a somewhat more elaborate method of measurement is used and then successively smaller sub- samples are drawn and successively more expensive, elaborate and accurate methods of measu rement are applied. This paper furnishes estimator and variance expressions for the three-phase design. The examples, arising from remote sensing applications, illustrate estimation of the po- pulation mean of a numerical characteristic and the population of a binary variable of interest.
Eormulas for optimum sampling rates are shown to be of the same form for the the two types of variables.
Primary Language | English |
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Subjects | Mathematical Sciences |
Journal Section | Research Articles |
Authors | |
Publication Date | January 1, 1987 |
Submission Date | January 1, 1987 |
Published in Issue | Year 1987 Volume: 36 Issue: 02 |
Communications Faculty of Sciences University of Ankara Series A1 Mathematics and Statistics.
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