1.   And the last would be a random sampling nationwide as a final check of the accuracy of their methods.

2.   From her home in Detroit she called a nationwide sampling of resale stores and found that those in New York and Los Angeles are the best buyers.

3.   The federal data were based on nationwide sampling using aerial photographs, supplemented by checking on the ground for accuracy.

4.   The scores are percentiles, derived from a scale developed through a nationwide sampling of children, said Dr. Camille Norvell, a Manhattan clinical psychologist.