Columbia subject headings:
Correlation (Statistics)
San Francisco Bay Area (Calif.)--Social conditions.
Social classes.
Social surveys.
Harvard subject headings:
San Francisco Bay Area (Calif.)--Social conditions.
Social classes--California--San Francisco Bay Area.
Social surveys--California--San Francisco Bay Area.
Princeton subject headings:
Correlation (Statistics)
San Francisco Bay Area (Calif.)--Social conditions.
Social classes.
Social surveys.