15.5 - Advanced Filtering

• Dynamic Queries - Adjusting sliders, buttons, etc and getting immediate feedback
• Also called direct-manipulation queries
• Use sliders and other related controls to adjust the query
• Get immediate (less than 100 msec) feedback with data
• Hard to update fast with large databases
• Need to accomplish the following:
• select a set of sliders from a large set of attributes
• specify greater than, less than, or greater than and less than
• deal with boolean combinations of slider settings
• choose among highlighting by color, points or light, regions, blinking, etc
• cope with tens of thousands of points
• permit weighting of criteria
• Commercial information-retrieval systems
• DIALOG and FirstSearch
• Use complex Boolean expressions - difficult to use
• Complexity has led to Venn diagrams and decision tables
• Water flow metaphor with filters
• can use AND, OR, NOT
• easy to learn and helps novice users
• User-Constructed set of Keywords
• Users create their profiles and media is scanned
• Called: Selective Dissemination of Information (SDI)
• Set of keywords is used to filter out information
• Collaborative Filtering
• Groups of users combine evaluations to help in finding items in a large database
• User "votes" and his info is used for rating the item on interest