notes-growth rates and doubling time

notes-growth rates and doubling time - Eco 572: Research...

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Eco 572: Research methods in Demography Growth Rates and Doubling Time The U.S. Census Bureau has population counts for the U.S. from 1790 to 2000, see http://www.census.gov/ population/censusdata/table-4.pdf. (Table 2 had slightly different counts for 1830 and 1940.) These data are in an ascii file called uspop1790p in the datasets section of the course website. The file has two columns, year and population, and you can read into Stata using . infile year long pop using /// > http://data.princeton.edu/eco572/datasets/uspop1790p.dat (22 observations read) We read the population as a long to be able to store all digits. We will plot the population in millions (otherwise we get bad labels) using absolute and log scales. . gen pm = pop/1000000 . label var pm "Population (millions)" . line pm year, name(abspop) . line pm year, yscale(log) name(logpop) . graph combine abspop logpop, title("U.S. Population") /// > ysize(3) xsize(6) . graph export uspop.png, replace (file uspop.png written in PNG format) Growth Rates What was the growth rate in the last intercensal period? Let us list the population counts for the last two censuses: http://data.princeton.edu/eco572/grdt.html (1 of 4) [2/11/2008 2:24:50 PM]
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Eco 572: Research methods in Demography . format pop
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notes-growth rates and doubling time - Eco 572: Research...

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