Quantile and InverseCDF
- To: mathgroup at smc.vnet.net
- Subject: [mg87819] Quantile and InverseCDF
- From: Peter Breitfeld <phbrf at t-online.de>
- Date: Fri, 18 Apr 2008 02:37:50 -0400 (EDT)
(* Version 6.0.2 for Mac PPC *) I thick I am missing something obvious: The documentation for InverseCDF says: "For a discrete Distribution dist the inverse CDF at q ist the largest integer x such CDF[dist,x]<=q. But I get binom=BinomialDistribution[20,0.3] InverseCDF[binom,0.5] ---> 6 Quantile[binom,0.6] ---> 6 CDF[binom,7] ---> 0.772... CDF[binom,6] ---> 0.608... CDF[binom,5] ---> 0.416... so the quantile ist the smallest integer such CDF[dist,x]>=q ?? Gruss Peter -- ==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-== Peter Breitfeld, Bad Saulgau, Germany -- http://www.pBreitfeld.de
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