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authorGary Mulder <flyingkiwiguy@gmail.com>2015-07-30 17:56:23 +0100
committerbitcoindev <bitcoindev@gnusha.org>2015-07-30 16:57:06 +0000
commit1f793e9bfe7232f7617ff4b7b05c05b256ce1c77 (patch)
treeecdf76dc52591ef0e58e1aa65e88f2860da97b74
parent89b95b965be040a8130655ef7e954531b7d76ba9 (diff)
downloadpi-bitcoindev-1f793e9bfe7232f7617ff4b7b05c05b256ce1c77.tar.gz
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Re: [bitcoin-dev] Block size following technological growth
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+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>
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+Cc: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>
+Subject: Re: [bitcoin-dev] Block size following technological growth
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+--001a114e43a6adb56c051c1a9766
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+
+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">&lt;<a href=3D"mailto:bi=
+tcoin-dev@lists.linuxfoundation.org" target=3D"_blank">bitcoin-dev@lists.li=
+nuxfoundation.org</a>&gt;</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&#39;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=
+ &quot;median&quot; 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 &quot;bad statistical model&quot; 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 &quot;respond&quot; 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--
+