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- From: trzyna@CS.ColoState.EDU (wayne trzyna)
- Subject: Re: Multiplying in the Backcountry (kids/population)
- Sender: news@yuma.ACNS.ColoState.EDU (News Account)
- Message-ID: <Nov18.173330.55951@yuma.ACNS.ColoState.EDU>
- Date: Wed, 18 Nov 1992 17:33:30 GMT
- Distribution: na
- References: <10776@vice.ICO.TEK.COM> <Bxw5LE.ErA@rice.edu> <10780@vice.ICO.TEK.COM>
- Nntp-Posting-Host: vivaldi.cs.colostate.edu
- Organization: Colorado State University, Computer Science Department
- Lines: 32
-
- In article <10780@vice.ICO.TEK.COM> hall@vice.ICO.TEK.COM (Hal F Lillywhite) writes:
- >In article <Bxw5LE.ErA@rice.edu> sbyrnes@rice.edu (Steven Byrnes) writes:
- >
- >>According to the CIA World Fact Book, available electronically via Project
- >>Gutenberg, the United States' total fertility rate is 1.8 children born per
- >>woman as of 1991. (The net migratation rate, according to this source, is
- >>2 migrants per 1,000 population as of 1991.)
- >
- >Interesting, especially if we do a bit of arithmetic on these
- >numbers. If we assume the average woman lives 80 years this is 160
- >immigrants per 1000 population during her lifetime. Approximately
- >half the population is female giving 160 immigrants per 500 females
- >or 0.32 average immigrants per female over her lifetime. Adding
- >this to the 1.8 average children she bears we get 2.12 new additions
- >to the population for each female over her lifetime. Since I don't
- >remember the exact replacement rate needed I'm not sure if this
- >represents positive or negative population growth, but it must be
- >close to the borderline. A 5.66% death rate of females prior to
- >maturity would put it at exactly flat growth. Of course I am
- >assuming an average lifetime for adult females which may not be
- >correct but I think we are in the ballpark. Immigration rates of
- >course fluctuate quite a bit so I don't think we are going to get an
- >exact answer anyway.
-
- If the statistics imply that the population is not growing, then
- the statistics are OBVIOUSLY incorrect. Sheesh!
-
-
- --
-
- -Wayne Trzyna
- trzyna@CS.ColoState.EDU
-