GEOG 3LT3 Lecture Notes - Lecture 8: Population Pyramid
18 Apr 2018
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Document Summary
This is the last session on this topic. Today he will talk about the application of the conceptual frameworks we have been looking at. One widely used indicator of accessibility is cumulative opportunities: this is the summation of potential opportunities that fall within a region. Potential accessibility: this summation is down weighted by the distance to opportunities. The threshold here is the distance from location i at which point we basically ignore opportunity j. We have a moving window but the values are not just 1 or 0 instead the values depend on the distance from location i. Typically the farther you get from i the smaller the value gets. This is because the probability of visiting a site that is at a longer distance is going to decline. Depending on the beta the curve will change its position. To deal with this we use a negative exponential( betadij) (picture shows how b affects the position of the curve.
