http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=15422
Bug ID: 15422
Summary: Number of items to order on holds ratio report will
not fulfill the holds ratio.
Change sponsored?: ---
Product: Koha
Version: master
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P5 - low
Component: Reports
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
When running the holds ratio report ( circ/reserveratios.pl ), I have the hold
ratio set to 3 (this is the threshold ratio, set in the Refine results box on
the right).
This is from the first row on the page:
Holds : 40
Items : 3
Hold Ratio : 13.33
...
Items needed: 4 to order
If we add the recommended 4 items, we have 40 holds and 7 items, which brings
the hold ratio to 5.7, which is still above the threshold ratio of 3.
In order to bring the actual hold ratio below the threshold ratio of 3,
I would need
40 / ( 3 + x ) = 3
40 = 9 + 3x
31 = 3x
10.3 = x
Or, more generally
$data->{reservecount} / ( $data->{itemcount} + $needed ) = $ratio
$data->{reservecount} / $ratio = $data->{itemcount} +
$needed
$needed = ( $data->{reservecount} / $ratio ) - $data->{itemcount}
Instead at circ/reserveratios.pl line 158, we have
ratiocalc => sprintf( "%.0d", $ratio_atleast1 ? ( $thisratio / $ratio ) :
$thisratio ),
which translates to
$needed = ( $data->{reservecount} / $data->{itemcount} ) / $ratio
This means that if the library orders the recommended number of copies, the
title will show up again on the holds ratio report, assuming that the number of
holds stays more or less constant.
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