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  1. Request For Comments
  2. RFC-333

Correctly use "Sigma" and "Err" everywhere

    Details

    • Type: RFC
    • Status: Implemented
    • Resolution: Done
    • Component/s: DM, TCT
    • Labels:

      Description

      As I recently learned in John Swinbank's review of PhotoCalib, the DPDD says this about "Err" and "Sigma":

      For all catalog data, we will employ a convention where estimates of standard errors have the suffix Err, while the estimates of inherent widths of distribution (or functions in general) have the suffix Sigma

      On the other hand, we use Sigma in many places where we really mean Err. For example, our source tables are littered with _fluxSigma and _xySigma, which are documented as "1-sigma uncertainty". Our database schema is mixed in this regard as well (e.g. raSigma, an "uncertainty" and uPSFluxSigma a "Standard deviation of the distribution" in the DiaSource table).

      This RFC is to gather consensus about how best to sanitize our usage of these terms in the stack and related software and interfaces. The concrete propose here is to replace all incorrect uses of Sigma with Err, and vice versa in all code below lsst_distrib and in cat.

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            Activity

            Parejkoj John Parejko created issue -
            tjenness Tim Jenness made changes -
            Field Original Value New Value
            Link This issue relates to DM-8050 [ DM-8050 ]
            Parejkoj John Parejko made changes -
            Watchers Jim Bosch, John Parejko, John Swinbank, Krzysztof Findeisen, Maria Patterson, Mario Juric, Paul Price, Robert Lupton, Simon Krughoff, Tim Jenness [ Jim Bosch, John Parejko, John Swinbank, Krzysztof Findeisen, Maria Patterson, Mario Juric, Paul Price, Robert Lupton, Simon Krughoff, Tim Jenness ] Andy Salnikov, Jim Bosch, John Parejko, John Swinbank, Krzysztof Findeisen, Maria Patterson, Mario Juric, Paul Price, Robert Lupton, Simon Krughoff, Tim Jenness [ Andy Salnikov, Jim Bosch, John Parejko, John Swinbank, Krzysztof Findeisen, Maria Patterson, Mario Juric, Paul Price, Robert Lupton, Simon Krughoff, Tim Jenness ]
            tjenness Tim Jenness made changes -
            Remote Link This issue links to "Page (Confluence)" [ 15028 ]
            Parejkoj John Parejko made changes -
            Planned End 27/Apr/17 8:16 PM 12/May/17 8:16 PM
            mjuric Mario Juric made changes -
            Labels dm-sst
            lpetrick Libby Petrick [X] (Inactive) made changes -
            Remote Link This issue links to "Page (Confluence)" [ 15070 ]
            tjenness Tim Jenness made changes -
            Remote Link This issue links to "Page (Confluence)" [ 15070 ]
            Parejkoj John Parejko made changes -
            Status Proposed [ 10805 ] Flagged [ 10606 ]
            krughoff Simon Krughoff made changes -
            Component/s TCT [ 13618 ]
            Parejkoj John Parejko made changes -
            Status Flagged [ 10606 ] Adopted [ 10806 ]
            tjenness Tim Jenness made changes -
            Link This issue is triggering DM-10932 [ DM-10932 ]
            rowen Russell Owen made changes -
            Link This issue relates to RFC-368 [ RFC-368 ]
            rowen Russell Owen made changes -
            Link This issue relates to RFC-271 [ RFC-271 ]
            rowen Russell Owen made changes -
            Link This issue is triggering DM-15244 [ DM-15244 ]
            rowen Russell Owen made changes -
            Risk Score 0
            swinbank John Swinbank made changes -
            Link This issue is triggering DM-10933 [ DM-10933 ]
            swinbank John Swinbank made changes -
            Link This issue is triggering DM-10935 [ DM-10935 ]
            swinbank John Swinbank made changes -
            Link This issue is triggering DM-10934 [ DM-10934 ]
            swinbank John Swinbank made changes -
            Link This issue is triggering DM-10932 [ DM-10932 ]
            Parejkoj John Parejko made changes -
            Link This issue relates to RFC-535 [ RFC-535 ]
            gcomoretto Gabriele Comoretto made changes -
            Remote Link This issue links to "Page (Confluence)" [ 24379 ]
            gcomoretto Gabriele Comoretto made changes -
            Remote Link This issue links to "Page (Confluence)" [ 24428 ]
            gcomoretto Gabriele Comoretto made changes -
            Remote Link This issue links to "Page (Confluence)" [ 24525 ]
            swinbank John Swinbank made changes -
            Resolution Done [ 10000 ]
            Status Adopted [ 10806 ] Implemented [ 11105 ]
            gcomoretto Gabriele Comoretto made changes -
            Remote Link This issue links to "Page (Confluence)" [ 24720 ]

              People

              • Assignee:
                Parejkoj John Parejko
                Reporter:
                Parejkoj John Parejko
                Watchers:
                Andy Salnikov, Gregory Dubois-Felsmann, Jim Bosch, John Parejko, John Swinbank, Kian-Tat Lim, Krzysztof Findeisen, Paul Price, Robert Lupton, Russell Owen, Simon Krughoff, Tim Jenness, Zeljko Ivezic
              • Votes:
                1 Vote for this issue
                Watchers:
                13 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved:
                  Planned End:

                  Summary Panel