LIMITATIONS AND ASSUMPTIONS While determining a geographical map unit for the analysis, it became necessary to aggregate data from the level of the Census tract to the School Zone level. This process is represented diagrammatically in the figure alongside. Within the study, the data used to create the “ENVIRONMENTAL” map required us to aggregate data. This was because data containing information regarding: Populations between the ages of 5 to 9 years; and Median Family Income was available at the census tract level. This data was downloaded from the American fact finder website, at the census tract level. The method of dasymetric estimation was used in order to aggregate it to the level of the Primary School zone.
School Zones
In the process we faced the challenge of addressing the Modifiable Areal unit Problem, which leads to statistical estimation which aggregating data.
Census tracts
0
0.5
1
2 Miles
