@article {28240, title = {A Measure of Segregation Based on Social Interactions}, journal = {Quarterly Journal of Economics}, volume = {122}, number = {2}, year = {2007}, note = {Matlab programs to calculate the Spectral index and Indices for metropolitan areas are available\ here. The relevant files follow:\ callspec.m,\ blockspectral.m,\ neighbors.m}, pages = {441-485}, author = {Roland Fryer and F. Echenique} }