Use short, familiar words
In effect, it was hypothesized that certain physical data categories including housing types and densities, land use, characteristics, and ecological location constitute a scaleable content area. This could be called a continuum of residential desirability. Likewise, it was hypothesized that several social data categories, describing the same census tracts, and referring generally to to the social stratification system of the city, would also be scaleable. This scale could be called a continuum of socioeconomic status. Thirdly, it was hypothesized that there would be a high positive correlation between the scale types on each continuum.
One can tell from an aerial photograph where rich and poor people live. The rich live in big houses set far apart. The poor live in small houses set close together.