Robert Bozick (right), a demographer at the RAND Corporation, and Beverly Weidmer, a survey director, review maps of a neighborhood selected to be included in the California Neighborhoods Count at the think tank’s headquarters in Santa Monica, Calif.

Robert Bozick (right), a demographer at the RAND Corporation, and Beverly Weidmer, a survey director, review maps of a neighborhood selected to be included in the California Neighborhoods Count at the think tank’s headquarters in Santa Monica, Calif.