Harrison, Rubinfeld (1978c) used a hedonic model to find out how house values were affected by air pollution in Boston, when other variables were taken into consideration. Their primary interest was in estimating willingness to pay for cleaner air. They chose to use 506 census tracts as units of...

Ecologists are often interested in studying the relationship between species and the environment, and between changes in the environment and changes in species occurrence. They consider that the spatial scales of the data generating processes for both the environmental and species variables...