|The SURVEYSELECT Procedure
The method of unrestricted random sampling (METHOD=URS) selects units
with equal probability and with replacement. Because units are
selected with replacement, a unit can be selected for the sample
more than once. The expected number of selections or hits for
each unit equals n/N when sampling without stratification.
For stratified sampling, the expected number of hits for a unit
in stratum h equals nh/Nh.
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