This is a preview. Log in through your library . Abstract In 2007, there were 33.2 million people around the world living with HIV/AIDS (UNAIDS/WHO, 2007). In May 2003, the U.S. President announced a ...
It is well known that the precision of an estimator can be improved if auxiliary variables are used. In particular, if the relationship is linear, a linear regression estimator is constructed. When ...
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