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removing old orphan tags, removed orphan tag using AWB

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{{Merge|Calls per second|date=July 2013}}
In [[telecommunications]], '''call volume''' refers to the number of [[telephone call]]s made during a certain time period. Depending on context, the phrase may refer to either the number of calls made to a specific physical [[area]] or [[telephone number]] (such as an [[emergency service]]) or the number of calls made between two or more areas (e.g. cities).

Various formulas exist to [[forecasting|forecast]] the number of calls that might be made; another key distinction concerns whether long or short-term trends are to be predicted.<ref name="How">See [http://www.isixsigma.com/library/content/c070430a.asp How to Do Call Volume Forecasting for Service Desks]</ref>

== Forecast Formulas ==

Perhaps the simplest formula used to forecast call volume is the [[linear equation]]

:<math>y = mx + b,</math>

where ''y'' is the expected call volume, ''x'' is time, and ''m'' and ''b'' are constants.

However, this is suitable for long-term trends only,<ref name="How" /> and further assumes that growth will be linear. Another formula, seen in a [[mathematics]] [[textbook]],<ref>{{cite book
|last = Blitzer
|first = Robert
|title = Introductory and Intermediate Algebra for college students -- 2nd ed.
|publisher = [[Pearson PLC|Pearson]] [[Prentice Hall]]
|year = 2006
|pages = 507
|isbn = 0-13-149259-4}}</ref> is the [[inverse square]] equation

:<math>C = \frac{0.02 P_1 P_2}{d^2},</math>

where ''C'' is the number of expected calls between two cities (during one day), ''P''<sub>1</sub> is the population of the first city (in thousands), ''P''<sub>2</sub> is the population of the other city (also in thousands), and ''d'' is the distance between them (units unclear in the book, but probably miles).

== See also ==
* [[Teletraffic engineering]]
* [[Calls per second]]

== References ==
{{Reflist}}

[[Category:Teletraffic]]
[[Category:Telecommunications economics]]

{{telecomm-stub}}

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en>Sadads: removing old orphan tags, removed orphan tag using AWB