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The SURVEYSELECT Procedure |
Murthy's algorithm first selects a unit with probability Z_{hi} . Then a second unit is selected from the remaining units with probability Z_{hj}/(1-Z_{hi}), where unit i is the first unit selected. The joint selection probability for units i and j in stratum h equals
Murthy's method requires that the relative size Z_{hi} be less than 0.5 for all units. Refer to Cochran (1977, pp. 263 -265) and Murthy (1957).
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