<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Dear Markus, dear Registry, <div class=""><br class=""></div><div class=""><div class="">I think it would be great to be able to get information on the distribution </div><div class="">of a specific column. So I’d like to follow-up on this Note you distributed </div><div class="">a while ago… </div><div class=""><br class=""></div><div class="">Has there been any further take-up from providers? </div><div class=""><br class=""></div><div class="">Some thoughts… </div><div class="">Adding higher order moments, the skewness and the kurtosis, </div><div class="">might give information on the underlying distribution. </div><div class="">That said, any choice can be debated. And percentiles are easy to understand </div><div class="">and calculate. I just find it a bit odd not to add values so used as mean and </div><div class="">standard deviation, but given the fact that underlying population might not be </div><div class="">a normal distribution, if added / used it deserves a bit of caution.</div></div><div class=""><div class=""><div dir="auto" class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div dir="auto" class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><span class=""><div class=""><br class=""></div><div class="">Thanks,</div><div class="">Ada</div></span></div></div></div></div><div class=""><br class=""></div><div class=""><div class="">
<div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">--<br class="">Astronome Adjointe<br class="">CDS, Observatoire Astronomique de Strasbourg (ObAS)<br class="">UMR 7550 Université de Strasbourg <br class="">11, rue de l'Université, F-67000 Strasbourg<br class="">+33 (0) 3 68 85 24 20</div></div></div></div></div>
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<div><br class=""><blockquote type="cite" class=""><div class="">Begin forwarded message:</div><br class="Apple-interchange-newline"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">From: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">Markus Demleitner <<a href="mailto:msdemlei@ari.uni-heidelberg.de" class="">msdemlei@ari.uni-heidelberg.de</a>><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Subject: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class=""><b class="">Advanced Column Statistics</b><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Date: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">30 April 2021 at 12:42:21 CEST<br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">To: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class=""><a href="mailto:interop@ivoa.net" class="">interop@ivoa.net</a><br class=""></span></div><br class=""><div class=""><div class="">Dear VO community,<br class=""><br class="">Since doing Registry searches using spatial, temporal, and spectral<br class="">constraints[1] is slowly becoming a reality with VODataService 1.2 in<br class="">RFC (still open for community comments:<br class=""><a href="https://wiki.ivoa.net/twiki/bin/view/IVOA/VODataServiceV12RFC" class="">https://wiki.ivoa.net/twiki/bin/view/IVOA/VODataServiceV12RFC</a>), it is<br class="">now time to think about the next step for blind discovery: Advanced<br class="">column statistics.<br class=""><br class="">The short version of the use case is: "Give me a catalogue of X<br class="">approximately complete to 15 mag in V".<br class=""><br class="">Based on Grégory's ideas I have written a note on this, in a format<br class="">somewhere between brainstorming and a roadmap, which Giulia has just<br class="">put up on the document repository:<br class=""><br class=""><a href="https://ivoa.net/documents/Notes/colstatnote/index.html" class="">https://ivoa.net/documents/Notes/colstatnote/index.html</a><br class=""><br class="">It would be great if you could have a look at the text with a view<br class="">at:<br class=""><br class="">* from the Apps perspective: Does the proposed metadata make sense<br class=""> for you? Is there additional low-hanging fruit we could pick with<br class=""> sensible extensions or alterations to the plan?<br class=""><br class="">* from the Registry perspective: How will we make data like this<br class=""> available for discovery purposes? Is vs:Stats a sane way to<br class=""> represent it?<br class=""><br class="">* from the DAL perspective: What would extended metadata in<br class=""> VODataService mean for TAP_SCHEMA?<br class=""><br class="">* for operators: Could you come up the the proposed metadata? Would<br class=""> you? I'd be happy to work with you to have a few more<br class=""> prototype implementations (beyond DaCHS, as discussed in the<br class=""> note).<br class=""><br class="">* for everyone: Are there any elephants in the room that I've<br class=""> overlooked so far?<br class=""><br class="">I'd suggest followup comments should go to Registry. And I'm happy<br class="">to have something like a spontaneous breakout on this at the next<br class="">interop (I'm told we'll have gathertown for it...)<br class=""><br class="">Thanks,<br class=""><br class=""> Markus<br class=""><br class="">[1] cf. https://ivoa.net/documents/Notes/Regstc/, which in some way<br class="">is part one of the new note.<br class=""></div></div></blockquote></div><br class=""></div></body></html>