<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <meta name="robots" content="index,follow"/> <title>Main features</title> <link rel="shortcut icon" href="favicon.ico"> <link href="tabs.css" rel="stylesheet" type="text/css"/> <link href="trademgen.css" rel="stylesheet" type="text/css"/> <link href="navtree.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="resize.js"></script> <script type="text/javascript" src="navtree.js"></script> <script type="text/javascript"> $(document).ready(initResizable); $(window).load(resizeHeight); </script> <link href="search/search.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="search/search.js"></script> <script type="text/javascript"> $(document).ready(function() { searchBox.OnSelectItem(0); }); </script> <script type="text/javascript"> var _gaq = _gaq || []; _gaq.push(['_setAccount', 'UA-25000976-1']); _gaq.push(['_setDomainName', 'none']); _gaq.push(['_setAllowLinker', true]); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 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Many more features and functions exist and for these we refer to the reference documentation.</p> <h1><a class="anchor" id="ft_demand_generation"></a> Demand generation</h1> <p>The demand can be generated thanks to two relatively advanced pieces of algorithm, both following a sequential principle. That is, the <a href="http://en.wikipedia.org/wiki/Event_(probability_theory)">events</a> (booking requests) are generated one after the other, sequentially, rather than being generated all at once at the beginning of the process (e.g., a simulation).</p> <p>The two sequential methods are:</p> <ul> <li>'Intuitive' method. The booking period is sliced in <a href="http://en.wikipedia.org/wiki/Interval_(mathematics)">intervals</a>, where the arrival rate of events (booking requests) is known for each of those intervals, say <img class="formulaInl" alt="$\lambda_i$" src="form_0.png"/>. The inter-arrival process then follows an <a href="http://en.wikipedia.org/wiki/Exponential_distribution">exponential law</a>. That is, the final number of booking requests follows a <a href="http://en.wikipedia.org/wiki/Non-homogeneous_Poisson_process">Non homogeneous Poisson distribution</a>. With that method, the <a href="http://en.wikipedia.org/wiki/Variance">variance</a> of that <a href="http://en.wikipedia.org/wiki/Probability_distribution">distribution</a> is therefore equal to the <a href="http://en.wikipedia.org/wiki/Mean">mean</a>.</li> <li>'Advanced' method. The process uses <a href="http://en.wikipedia.org/wiki/Order_statistic">order statistics</a> in order to mimic the behaviour of <a href="http://en.wikipedia.org/wiki/Uniform_distribution_(continuous)">uniform distributions</a> projected onto the know arrival pattern of events. With that method, the final number of booking requests is first drawn, following any probability distribution (e.g., <a href="http://en.wikipedia.org/wiki/Normal_distribution">normal</a>, <a href="http://en.wikipedia.org/wiki/Gamma_distribution">Gamma</a>, <a href="http://en.wikipedia.org/wiki/Beta_distribution">Beta</a> or even Weibull law) with any required standard deviation. Then, each booking request is drawn in sequence:<ul> <li>according to a mere <a href="http://en.wikipedia.org/wiki/Uniform_distribution_(continuous)">uniform distribution</a>,</li> <li>and projected onto the known booking arrival pattern.</li> </ul> </li> </ul> <h1><a class="anchor" id="ft_others"></a> Other features</h1> <ul> <li>CSV input file parsing</li> <li>Memory handling </li> </ul> </div></div><!-- contents --> </div><!-- doc-content --> <li class="footer">Generated on Wed May 22 2013 22:01:48 for TraDemGen by <a href="http://www.doxygen.org/index.html"> <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.3.1 </li> <li class="footer"> <a href="http://sourceforge.net/projects/trademgen"><img class="footer" src="http://sflogo.sourceforge.net/sflogo.php?group_id=264773&type=12&format=.png" alt="SourceForge Logo"></a> </li> </ul> </div> </body> </html>