<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<br>
Hi Bo , Hi semantics, <br>
<br>
We have re-examined your use case together with S. Derriere and A.
Preite Martinez and checked also how Vizier handles percentiles.<br>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">There is indeed currently no proper way
to describe with UCDs that a measurement is associated to some
percentile<br>
of a statistical model/distribution.</div>
<div class="moz-cite-prefix">Creating a new word could help describe
these values : <br>
<pre>Q stat.percentile Percentile in a statistical distribution</pre>
</div>
<div class="moz-cite-prefix">We could also have a few more precise
words to address exactly what you are trying to describe :</div>
<div class="moz-cite-prefix">
<pre>Q stat.percentile.1sigma Percentile corresponding to one standard deviation from the median</pre>
</div>
<div class="moz-cite-prefix">
<div class="moz-cite-prefix">
<pre>Q stat.percentile.2sigma Percentile corresponding to two standard deviations from the median</pre>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">With these words, we could use :<br>
<pre style="margin-left: 2em; font-family: monospace; caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: -webkit-left; text-indent: 0px; text-transform: none; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;">ucd="src.redshift.phot;stat.percentile.2sigma;stat.min" for EAZY 2.5% percentile of photo-z
</pre>
<pre style="margin-left: 2em; font-family: monospace; caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: -webkit-left; text-indent: 0px; text-transform: none; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;">ucd="src.redshift.phot;stat.percentile.1sigma;stat.min" for EAZY 16% percentile of photo-z AND LePhare photo-z lower limit, 68% conf. level
ucd="src.redshift.phot;stat.median" for EAZY 50% percentile of photo-z
ucd="src.redshift.phot;stat.percentile.1sigma;stat.max" for EAZY 84% percentile of photo-z AND LePhare photo-z upper limit, 68% conf. level
ucd="src.redshift.phot;stat.percentile.2sigma;stat.max" for EAZY 16% percentile of photo-z
</pre>
</div>
<div class="moz-cite-prefix">In the UCD vocabulary, maybe an extra
word would cover all possible cases :</div>
<div class="moz-cite-prefix">
<pre>Q stat.percentile.3sigma Percentile corresponding to three standard deviations from the median
</pre>
I hope this helps . <br>
I have created a VEP-UCD for this term , and will circulate it
in the UCD Board to discuss it for adoption .<br>
<br>
Tell us wheter you can use this , and your feedback in case . <br>
Thanks in advance .<br>
<br>
Mireille & Sebastien <br>
CDS, Strasbourg <br>
----------------<br>
</div>
<div class="moz-cite-prefix">
<hr width="100%" size="2"></div>
</div>
</body>
</html>