Advocates of the use of ecological regression as an indicator of ethnic voting behavior have not demonstrated its validity. The neighborhood model, which assumes that within each precinct Hispanic Americans and non-Hispanic Americans vote alike, is supported as a better way to draw conclusions about voting behavior. (SLD)

The use of ecological regression in voting rights cases is discussed in the context of a lawsuit against Los Angeles County (California) in 1990. Ecological regression assumes that systematic voting differences between precincts are explained by ethnic differences. An alternative neighborhood model is shown to lead to different conclusions. (SLD)