From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM autolearn=unavailable autolearn_force=no version=3.4.4 X-Received: by 10.182.116.230 with SMTP id jz6mr21004754obb.2.1427990321590; Thu, 02 Apr 2015 08:58:41 -0700 (PDT) X-Received: by 10.140.91.47 with SMTP id y44mr178650qgd.39.1427990321527; Thu, 02 Apr 2015 08:58:41 -0700 (PDT) Path: border2.nntp.dca1.giganews.com!nntp.giganews.com!l13no827781iga.0!news-out.google.com!q14ni5765ign.0!nntp.google.com!j5no106870qga.1!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail Newsgroups: comp.lang.ada Date: Thu, 2 Apr 2015 08:58:41 -0700 (PDT) In-Reply-To: <1q1hq0qt8n15$.kxfdpvio0p1w.dlg@40tude.net> Complaints-To: groups-abuse@google.com Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=193.17.19.232; posting-account=ku4DIwoAAACRt0A2H-srh5aOk_YodLAH NNTP-Posting-Host: 193.17.19.232 References: <59ac455c-72f6-43e2-8a79-efc0f3e16d9a@googlegroups.com> <19qfgu5pjszm5.s5y5u8r0zx8k.dlg@40tude.net> <161a69af-a392-4214-bd92-0e20e7522cca@googlegroups.com> <1ht5q4lxmtf3p.mntbczbpti5n.dlg@40tude.net> <0ac76a41-d276-47d4-8659-530229802d12@googlegroups.com> <1ieaan02ff638.n6kjnn72tsp3$.dlg@40tude.net> <1o9qidr7413f4$.1jbc41w6r9j62.dlg@40tude.net> <1q1hq0qt8n15$.kxfdpvio0p1w.dlg@40tude.net> User-Agent: G2/1.0 MIME-Version: 1.0 Message-ID: <7ec7c26a-fa55-4ae4-a6c5-b117e2ca3836@googlegroups.com> Subject: Re: Languages don't matter. A mathematical refutation From: =?ISO-8859-1?Q?Jean_Fran=E7ois_Martinez?= Injection-Date: Thu, 02 Apr 2015 15:58:41 +0000 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Xref: number.nntp.giganews.com comp.lang.ada:192684 Date: 2015-04-02T08:58:41-07:00 List-Id: On Thursday, April 2, 2015 at 3:36:02 PM UTC+2, Dmitry A. Kazakov wrote: >=20 > > To change the subject a bit, is there any possibility of using > > the probabilistic approach to estimating the long-term cost of > > maintenance given a history of errors with a particular language? >=20 > I don't think so. Errors do not occur, they are present or introduced. Th= e > only probabilistic model could be random selection of a given error from > the pool of errors. This is not related to the language choice. All > difference here is in the pools, since errors made in C are different fro= m > errors made in Ada. You change the language, you get *other* errors, no > statistics across to compare. >=20 Really? Errors occur because of progarmmer quality, physical shape (had a = bad night), distracting events, use of alcohol and drugs and plenty, plenty= of factors. One of them being that a bird has just landed in front of y= our window. Random. =20 Then you take a lot of programmers or more exactly two lots, calculate aver= ages, standard deviations and apply the appropriate test against that diffe= rence. Then that test tells you if difference is too small to discard the = null hypothesis (same rate of success for both groups) or far too large for= it holding water. Ij the later case you try to understand why. BTW. Since you brought this silliness: defect rate in manufacturing plants= is not governed by thermodynamics but by factors such as equipment and sta= te of teh work force. On Mondays (use of alcohol during week-end) and Fri= day (tiredness) you are going to find a significantly higher rate of defect= s and of work accidents. Significantly like far beyind what could be expec= ted from just random noise. Jean Fran=E7ois Martinez