Miami: Mistress of the Americas

Appendix 2: Mapping Locals, Exiles, and Mobiles

a p p e n d i x 2 Mapping Locals, Exiles, and Mobiles Two of the maps in Chapter 7 (figs. 20 and 28) are based on data from the U.S. census of 2000. Miami-Dade and Broward counties together constitute 626 census tracts. The geographical size of tracts varies considerably and is generally based on population density. The population in most tracts ranges from a few thousand to about eleven thousand people. The most extreme tracts in terms of localness or transience (81 out of 626) are selected as follows: • The ‘‘most local’’ tracts are identified as those with a minimum of 65 percent of the population born in-state and a minimum of 92 percent who lived in the metropolitan area five years earlier in 1995. This resulted in a selection of 24 ‘‘most local’’ tracts. • The least local or ‘‘most transient’’ tracts (57) were compiled in two steps. The first selection pertained to tracts with at least 75 percent of the population having been born abroad (33 tracts). The second selection identified all tracts with at least 85 percent of the population born out of state and at least 30 percent of the population who did not live in the metropolitan area five years earlier in 1995 (24 tracts). Figure A1 shows clusters of census tracts with extreme concentrations of locals, exiles, and mobiles based on the percentage of { 217 } Figure A1. Census tract clusters with high concentrations of locals, exiles, and mobiles. Source: 2000 U.S. Census, Tables P001001, P021003, P025001, P025003, P025006. the population born out of state and the percentage of the population who did not live in the metropolitan area five years earlier. Tracts identified as exiles and mobiles both have a very high proportion of people who were born out of state (over 78 percent)— the difference is that mobile tracts in recent years have shown greater mobility than exile tracts. The first map (fig. 20) in Chapter 7 is based on this scatter plot. Figure A2 draws a different distinction among the 57 ‘‘most transient’’ tracts. It plots the percentage of the population that was born out of state versus the percentage born abroad. As such, it allows us to differentiate among tracts with concentrations of foreign transients, tracts with domestic transients, and tracts with a mix of foreign and domestic transients. The second map (fig. 28) in Chapter 7 is based on the clusters in this scatter plot. { 218 } a p p e n d i x 2 Figure A2. Census tract clusters with high concentrations of domestic transients, foreign transients, and mixed transients (both foreign and domestic). Source: 2000 U.S. Census, Tables P001001, P021003, P021013. ...