Help/RateItPlugin

RateIt: A recommender system, based on MovieLens and "suggest".

Store user ratings per pagename. The wikilens theme displays a navbar image bar with some nice Javascript magic and this plugin shows various recommendations.

There should be two methods to store ratings:

• In a SQL database as in wikilens http://dickens.cs.umn.edu/dfrankow/wikilens

The most important fact: A page has more than one rating. There can be (and will be!) many ratings per page (ratee): different raters (users), in different dimensions. Are those stored per page (ratee)? Then what if I wish to access the ratings per rater (user)?

Wikilens plans several user-centered applications like:

• a) show my ratings
• b) show my buddies' ratings
• c) show how my ratings are like my buddies'
• d) show where I agree/disagree with my buddy
• e) show what this group of people agree/disagree on

If the ratings are stored in a real DB in a table, we can index the ratings by rater and ratee, and be confident in performance. Currently MovieLens has 80,000 users, 7,000 items, 10,000,000 ratings. This is an average of 1400 ratings/page if each page were rated equally. However, they're not: the most popular things have tens of thousands of ratings (e.g., "Pulp Fiction" has 42,000 ratings). If ratings are stored per page, you would have to save/read huge page metadata every time someone submits a rating. Finally, the movie domain has an unusually small number of items-- I'd expect a lot more in music, for example.

For a simple rating system one can also store the rating in the page metadata (default).

Recommender Engines:

• Recommendation/Prediction is a special field of "Data Mining"

• For a list of (also free) software see http://www.the-data-mine.com/bin/view/Software/WebIndex

  • movielens: (Java Server) will be gpl'd in summer 2004 (weighted)
  • suggest: is free for non-commercial use, available as compiled library (non-weighted)
  • Autoclass: simple public domain C library
  • MLC++: C++ library http://www.sgi.com/tech/mlc/

Usage

Note: The wikilens theme or any derivate must be enabled, to enable this plugin!

        <<RateIt>> just the widget without text
        <<RateIt show=top>> text plus widget below
        <<RateIt show=ratings>> to show my ratings
TODO:   <<RateIt show=buddies>> to show my buddies
        <<RateIt show=ratings dimension=1>>
TODO:   <<RateIt show=text>> just text, no widget, for dumps

Arguments

Argument	Description	Default value
pagename	The page to execute upon	current pagename
version		false
version		false
id		rateit
imgPrefix	(empty) or BStar or Star	(empty)
dimension		false
small		false
show		false
mode		false

Example

<<RateIt>>

Author

• Dan Frankowski (wikilens author),
• Reini Urban (as plugin)

See Also

• Help:UserRatingsPlugin