[Babase] ranking clarification needed

Jun Yang junyang at gmail.com
Mon Sep 10 17:40:21 EDT 2007


On 9/2/07, Susan Alberts <alberts at duke.edu> wrote:

> 1. Given a month, a group, and a ranktype, there is just one ranking.
>
> Yes this is correct. In the RANKS table in babase, each "rank" refers to
> exactly one month, group and ranktype.
>
> In particular, we never produce a ranking that "spans" multiple
> months. This assumption is reflected by the current design of the
> RANKS table.
>

I thought I got this all cleared up, but here here is one more question.

RNKTYPES table uses a SQL query to define the set of individuals to
rank for a given rank type. This definition takes three input
parameters: group, start date, and end date. However, shouldn't the
group of individuals be determined by the group and the month of the
ranking alone? So why two dates? Should they always be the first and
the last days of the month, respectively?

An alternative interpretation is that the RNKTYPE query gives the set
of individuals to show in the interaction matrix of the ranker, which
can be produced from an arbitrary date range (which can be long than
the month being ranked). In that case, what happens when this set
differs from the set of individuals to be included in the ranking?

Thanks!

--- Jun Y.


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