What does TOP mean ?

[Arnold Rots]

Yes, you need an observatory-specific model to calculate a score.
By its very nature, therefore, it will only be a relative score.
Example:
For Chandra we implemented a score that is based on instrument, exposure
time, and off-axis angle
(PSF degrades with increasing off-axis angle).

  - Arnold

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Arnold H. Rots                                          Chandra X-ray
Science Center
Smithsonian Astrophysical Observatory                   tel:  +1 617 496
7701
60 Garden Street, MS 67                                      fax:  +1 617
495 7356
Cambridge, MA 02138
arots at cfa.harvard.edu
USA
http://hea-www.harvard.edu/~arots/
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On Mon, Apr 27, 2015 at 3:25 AM, Markus Demleitner <
msdemlei at ari.uni-heidelberg.de> wrote:

> Hi Petr, hi SSA crowd,
>
> On Sat, Apr 25, 2015 at 01:38:26AM +0200, Petr Skoda wrote:
> >
> > And does anybody implemented TOP in scoring manner in SSAP ?
>
> Well, DaCHS accepts TOP but treats it equivalently to MAXREC so far
> (which I claim is legal, as that simply means I give all matching
> results the same score).
>
> The basic difficulty in doing a meaningful implementation is that you
> need to compute a score, and this kind of scoring in general is
> either difficult (because to do it properly you need a statistical
> model of both the data and the user) or haphazard (involving
> combining more or less ad-hoc measures for how good a match is for a
> certain constraint weighted... somehow).
>
> I think it would be a moderately worthwhile effort to create a model
> of either kind for SSAP's parameter set and validate it with user
> studies.  Has anyone perhaps already started on such a thing?
>
> My suspicion is that this model could work well across a multitude of
> services and domains with no or just a single parameter.  Be that as
> it may, I'm afraid I don't see GAVO tackling something like that any
> time soon.
>
> Cheers,
>
>         Markus
>
>
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