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Population and Exchange Rate to US$ by countries 1950-2009 (an animated interactive map)
Thu, 05/05/2011 - 16:51 — Andrey-enSource http://pwt.econ.upenn.edu/php_site/pwt_index.php
The Median Age of 1950-2050 (an animated interactive map)
Sat, 19/03/2011 - 23:45 — schegloffWhat is the formula for median age?
After you order the n individual ages from youngest to oldest you can find the location of the median with the formula M=(n+1)/2.
For example, if you have an odd number of ages such as 7, 23, 35, 53, 99 then the median will be the (n+1)/2=(5+1)/2=3rd observation of the ordered set. Hence the median age is 35 years. Exactly half the ages are less than 35 and exactly half the ages are more than 35.
If, on the other hand, you have an even number of ages such as 7, 23, 35, 53, 75, 99 then the location of the median will be at position (n+1)/2=(6+1)/2=3.5 of the ordered set. Since there is no "three and halfth" observation you need to take the average of the 3rd and 4th observation. Hence the median age is (35+53)/2=44 years.
easy way out middle age is the median age
Read more: http://wiki.answers.com/Q/What_is_the_formula_for_median_age#ixzz1H51znXCj
Source Gapminder "indicator_median_age".
Population pyramid - interactive map (age structure diagram)
Tue, 15/03/2011 - 12:48 — schegloffSource data: www.census.gov
Read more http://en.wikipedia.org/wiki/Population_pyramid
Moscow's Index
Sat, 19/02/2011 - 16:32 — RussianSphinxMoscow's Index= Country's population / Moscow's population
Income per person, Fertility rate per 1 woman and Population of the World (1960-2009)
Tue, 17/08/2010 - 00:05 — Andrey-en
Population growth rate, % (est. 2010)
Mon, 09/08/2010 - 12:25 — Andrey-enSource: CIA.
Total world population grouth: 1.13%
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