From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <flyingkiwiguy@gmail.com> Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id CF01A514 for <bitcoin-dev@lists.linuxfoundation.org>; Thu, 30 Jul 2015 16:57:06 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.7.6 Received: from mail-yk0-f180.google.com (mail-yk0-f180.google.com [209.85.160.180]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 9F990ED for <bitcoin-dev@lists.linuxfoundation.org>; Thu, 30 Jul 2015 16:57:03 +0000 (UTC) Received: by ykax123 with SMTP id x123so38990354yka.1 for <bitcoin-dev@lists.linuxfoundation.org>; Thu, 30 Jul 2015 09:57:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-type; bh=nXwo/zgjTWngypPR+b4He1G0eWcQnqL0b6Kec3+B8WM=; b=ttpWrITwPo6OZZ99J2478zwrAfMEl9ligHxu8hkyyUOyv07WChvgbxrF3R5NxCFmu2 uMReQZ+Ht3b7mXG4f/ro7vs1drF9LE67yjYO5zfkJitaG8p0IwIwxz56qCupnMfTAOj9 y0luh+8lQ2bCKIsltBqOOnKaSVPtfRlTDmyeKlr33VBJ3eY2B5eQUDijYkPytQWcvfXG fPHeU/3xN+UT32LtOi83Wr4k+ygKUfKWren8qhbDfpMHpQXhqsnWsBoV6vEljhL7DSEm jscLO2X9ateG3cVQFh2haaOE92uCS/mVFKW00p0d8axObajiw1bvFD+pOnjUPSgvc1we o/0Q== X-Received: by 10.13.204.150 with SMTP id o144mr52859464ywd.54.1438275423023; Thu, 30 Jul 2015 09:57:03 -0700 (PDT) MIME-Version: 1.0 Received: by 10.129.74.8 with HTTP; Thu, 30 Jul 2015 09:56:23 -0700 (PDT) In-Reply-To: <CABm2gDrHjfkC+whh3Vh2LZNdSR1WSAXpNitR-jEdxtbKj7J25g@mail.gmail.com> References: <CAPg+sBj-wA1DMrwkQRWnzQoB5NR-q=2-5=WDAAUYfSpXRZSTqw@mail.gmail.com> <CABm2gDrHjfkC+whh3Vh2LZNdSR1WSAXpNitR-jEdxtbKj7J25g@mail.gmail.com> From: Gary Mulder <flyingkiwiguy@gmail.com> Date: Thu, 30 Jul 2015 17:56:23 +0100 Message-ID: <CAKy9zTA1j6311Y8uo-c_z2JQr8gEwf_gH+HH56rRgZac9fqh9Q@mail.gmail.com> To: =?UTF-8?B?Sm9yZ2UgVGltw7Nu?= <jtimon@jtimon.cc> Content-Type: multipart/alternative; boundary=001a114e43a6adb56c051c1a9766 X-Spam-Status: No, score=-2.7 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,HTML_MESSAGE,RCVD_IN_DNSWL_LOW autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org Cc: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org> Subject: Re: [bitcoin-dev] Block size following technological growth X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Bitcoin Development Discussion <bitcoin-dev.lists.linuxfoundation.org> List-Unsubscribe: <https://lists.linuxfoundation.org/mailman/options/bitcoin-dev>, <mailto:bitcoin-dev-request@lists.linuxfoundation.org?subject=unsubscribe> List-Archive: <http://lists.linuxfoundation.org/pipermail/bitcoin-dev/> List-Post: <mailto:bitcoin-dev@lists.linuxfoundation.org> List-Help: <mailto:bitcoin-dev-request@lists.linuxfoundation.org?subject=help> List-Subscribe: <https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev>, <mailto:bitcoin-dev-request@lists.linuxfoundation.org?subject=subscribe> X-List-Received-Date: Thu, 30 Jul 2015 16:57:06 -0000 --001a114e43a6adb56c051c1a9766 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 30 July 2015 at 16:12, Jorge Tim=C3=B3n <bitcoin-dev@lists.linuxfoundati= on.org > wrote: > 1) Unlike previous blocksize hardfork proposals, this uses median time > instead of block.nTime for activation. I like that more but my > preference is still using height for everything. But that discussion > is not specific to this proposal, so it's better if we discuss that > for all of them here: > > http://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-July/009731.h= tml Note that a "median" is a special case of a 50% percentile. If you desire to apply a more stringent criteria you can use the 75th or even 90th percentile. https://en.wikipedia.org/wiki/Percentile Perhaps if a statistician (i.e. not me) could be found to offer her services, she could become a resource for helping selecting the most appropriate statistical algorithms on request (and implemented Integer math as per Gavin, from memory), considering the consequences of learning post-fork that a "bad statistical model" was chosen. e.g. an exponentially weighted moving average is usually much less volatile and harder to manipulate than a simple moving average, but still can "respond" to short term drivers. Regards, Gary --001a114e43a6adb56c051c1a9766 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div class=3D"gmail_extra"><span style=3D"font-size:12.800= 0001907349px">On 30 July 2015 at 16:12, Jorge Tim=C3=B3n=C2=A0</span><span = dir=3D"ltr" style=3D"font-size:12.8000001907349px"><<a href=3D"mailto:bi= tcoin-dev@lists.linuxfoundation.org" target=3D"_blank">bitcoin-dev@lists.li= nuxfoundation.org</a>></span><span style=3D"font-size:12.8000001907349px= ">=C2=A0wrote:</span><br style=3D"font-size:12.8000001907349px"><blockquote= class=3D"gmail_quote" style=3D"font-size:12.8000001907349px;margin:0px 0px= 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-= left-style:solid;padding-left:1ex">1) Unlike previous blocksize hardfork pr= oposals, this uses median time<br>instead of block.nTime for activation. I = like that more but my<br>preference is still using height for everything. B= ut that discussion<br>is not specific to this proposal, so it's better = if we discuss that<br>for all of them here:<br><a href=3D"http://lists.linu= xfoundation.org/pipermail/bitcoin-dev/2015-July/009731.html" rel=3D"norefer= rer" target=3D"_blank">http://lists.linuxfoundation.org/pipermail/bitcoin-d= ev/2015-July/009731.html</a></blockquote><div style=3D"font-size:12.8000001= 907349px"><br></div><div style=3D"font-size:12.8000001907349px">Note that a= "median" is a special case of a 50% percentile. If you desire to= apply a more stringent criteria you can use the 75th or even 90th percenti= le.</div><div style=3D"font-size:12.8000001907349px"><br></div><div style= =3D"font-size:12.8000001907349px"><a href=3D"https://en.wikipedia.org/wiki/= Percentile" target=3D"_blank">https://en.wikipedia.org/wiki/Percentile</a><= br></div><div style=3D"font-size:12.8000001907349px"><br></div><div style= =3D"font-size:12.8000001907349px">Perhaps if a statistician (i.e. not me) c= ould be found to offer her services, she could become a resource for helpin= g selecting the most appropriate statistical algorithms on request (and imp= lemented Integer math as per Gavin, from memory), considering the consequen= ces of learning post-fork that a "bad statistical model" was chos= en.</div><div style=3D"font-size:12.8000001907349px"><br></div><div style= =3D"font-size:12.8000001907349px">e.g. an exponentially weighted moving ave= rage is usually much less volatile and harder to manipulate than a simple m= oving average, but still can "respond" to short term drivers.=C2= =A0</div><div style=3D"font-size:12.8000001907349px"><br></div><div style= =3D"font-size:12.8000001907349px">Regards,</div><div style=3D"font-size:12.= 8000001907349px">Gary</div></div></div> --001a114e43a6adb56c051c1a9766--