Each observation in the LIFEXP data set contains information on 1950 and 1993 life expectancies at birth for 16 nations(footnote 1). The birth rate for each nation is classified as stable (1) or rapid (2). The nations with missing data obtained independent status after 1950. 
data lifexp;
   input PopulationRate Country $char14. Life50 Life93 @@;
   label life50='1950 life expectancy'
         life93='1993 life expectancy';
   datalines;
2 Bangladesh     .  53 2 Brazil         51 67
2 China          41 70 2 Egypt          42 60
2 Ethiopia       33 46 1 France         67 77
1 Germany        68 75 2 India          39 59
2 Indonesia      38 59 1 Japan          64 79
2 Mozambique      . 47 2 Philippines    48 64
1 Russia          . 65 2 Turkey         44 66
1 United Kingdom 69 76 1 United States  69 75
;
FOOTNOTE 1:  Data are from VITAL SIGNS 1994: The Trends That Are Shaping Our Future by Lester R. Brown, Hal Kane, and David Malin Roodman, eds. Copyright (c) 1994 by Worldwatch Institute. Reprinted by permission of W.W. Norton & Company, Inc. [arrow]