Table 2 Temporal change of the values of inhomogeneity and silhouette metrics in 6 1990-defined groups

1 (dark green)

low diversity and low segregation

Providence, Albany, Knoxville, Greenville, Minneapolis, Salt Lake City, Portland

0.2

0.18

0.26

0.29

2 (red)

low diversity and high segregation

Buffalo, Pittsburgh, Philadelphia, Memphis, Louisville, Birmingham, Milwaukee, Indianapolis, Detroit, Dayton, Cleveland, Cincinnati, St. Louis

0.19

0.21

0.39

0.28

3 (light green)

medium diversity and low segregation

Virginia Beach, Raleigh, Orlando,Tulsa, Oklahoma City, El Paso, Denver, Phoenix, Las Vegas, Seattle

0.11

0.15

0.51

0.16

4 (orange)

high diversity and low segregation

San Antonio, Austin, Albuquerque,Tucson, San Francisco, San Diego, Sacramento, Riverside, Fresno

0.16

0.15

0.31

0.22

5 (dark red)

high diversity and moderate to high segregation

New York, Washington, Chicago, New Orleans, Houston, Dallas, Los Angeles

0.24

0.21

0.14

0.22

6 (blue)

low diversity and medium segregation

Hartford, Boston, Rochester, Richmond, Harrisburg,Tampa, Nashville, Miami, Jacksonville, Greensboro, Charlotte, Atlanta, Grand Rapids, Columbus, Kansas City

0.15

0.19

0.35

0.10