search for: erlb

...king callers to guess when the line is free and equally spacing their calls is not terribly realistic (as the author of the comment above goes on to imply). So how does one analyse such a situation? Using statistical traffic modelling! For more information, see http://www.erlang.com/calculator/erlb/ Plug in: Busy Hour Traffic: 0.937 Erlangs (based on 45 * 4 * 2.5 / 480) Acceptable Blocking Factor: 1% (we will accept 1 in 100 calls receiving a busy signal) Result: you will need 5 incoming lines. If you are willing to tolerate (say) 3% of calls receiving a busy signal, you can get by...

...A DISTRIBUTION A nicer version of elf() exploits R's wonderful gamma distribution functions! I use the fact, perhaps not generally known, that the Erlang Loss Function is the ratio of the gamma density to the gamma CDF, for suitable parameters. (Also, I'll change the name from elf() to erlb(), because this function is sometimes called "Erlang's B function", and because 'elf' is an abbreviation in frequent use with a different meaning in the Unix world.) Here is the code: erlb<- function(nsrv, nerl, log=FALSE) { # Returns Erlang-B blockage for nsrv servers...