Air quality index: Difference between revisions

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en>Rjwilmsi
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{{unreferenced|date=October 2009}}
44 yr old Advertising Specialist Werner Styers from Ladner, has lots of passions including hang gliding, new launch property singapore and candle making. Has enrolled in a global contiki voyage. Is quite ecstatic specifically about visiting Mount Qingcheng and the Dujiangyan Irrigation System.<br><br>Visit my site; [http://nanne8930.buzznet.com/user/journal/18079909/new-launch-property/ http://nanne8930.buzznet.com/]
[[Image:Net migration rate world.PNG|right|300px|thumb|Net migration rates for 2008. Legend: {{legend|RoyalBlue|positive}}
{{legend|Chocolate|negative}}
{{legend|LimeGreen|stable}}
{{legend|DarkGray|no data}}]]
 
'''Net migration rate''' is the difference of [[immigrant]]s and [[emigrant]]s of an area in a period of time, divided (usually) per 1,000 inhabitants (considered on midterm population). A positive value represents more people entering the country than leaving it, while a negative value means more people leaving than entering it.
 
==Example==
On January 1, 2000 country '''A''' has a population of 1,000,000 inhabitants. From that date to January 1, 2001, 200,000 people immigrated to '''A''', and 100,000 people left the country. At the same time, there were 100,000 babies born, and nobody died. Therefore, the population of '''A''' On January 1, 2001 is 1,200,000.
 
We consider that on July 1, 2000 (the middle of our time term) there were 1,100,000 inhabitants.
And since 100,000 left and 200,000 came, the migration difference is +100,000.
 
<math>100,000  \div 1,100,000 = 0.09091</math>
 
But this value is per inhabitant, and we want a per 1,000 persons value:
 
<math>0.09091 \times 1,000 = 90.91</math>
 
This number gives us a comparable idea of the impact of migration on the country's population.
 
==See also==
*[[Demography]]
*[[Human migration]]
*[[List of countries by net migration rate]]
*[[Population dynamics]]
*[[Migration Efficiency]]
 
==External links==
*[http://www.nationmaster.com/red/graph-T/imm_net_mig_rat&int=-1 World Net migration rate Map]
*[http://www.planetwire.org/glossarylist/N Planet Wire - Glossary of Terms]
*[http://www.census.gov/ipc/www/wp96glos.html Census Bureau - Glossary]
 
[[Category:Population|Migration rate, net]]
[[Category:Demography]]
[[Category:Human migration]]
 
{{Socio-stub}}

Latest revision as of 17:58, 23 December 2014

44 yr old Advertising Specialist Werner Styers from Ladner, has lots of passions including hang gliding, new launch property singapore and candle making. Has enrolled in a global contiki voyage. Is quite ecstatic specifically about visiting Mount Qingcheng and the Dujiangyan Irrigation System.

Visit my site; http://nanne8930.buzznet.com/