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Urban Start-up Agglomeration and Venture Capital Investment (view source)
Revision as of 15:40, 3 September 2019
, 15:40, 3 September 2019→Elbow on fraction of locations in hulls
[[File:Elbowdataresult.png|right]] The '''elbowcalc''' and '''elbowdata''' queries provide the data. '''elbowdata''' takes layer/finallayer (i.e., fraction unclustered, as the layer 1 is the all encompassing hull and final layer is the raw locations), rounds it to two digits, and then calculates the average fraction of locations in hulls and the average hull area fraction of all encompassing hull area. The former gives a nice curve with an elbow (found by taking the second derivative and setting it equal to zero) at x=0.40237.
We then identify the layer that is closest to having a fraction of locations in hulls of 0.40237, taking the lower level (i.e., the more clustered level) whenever there is a tie. The resulting indicator variable is called '''elbowflhlayer''' and is made in table '''Elbowflh'''. This is analyzed in a sheet in "Images Review.xlsx" in E:\projects\agglomeration.
===Image Analysis===
