Summary: SMART weighting specification

While the variety of potential keyword weighting schemes (signal/noise, IDF, keyword discrimination, etc.) may seem large, there is in fact a systematicity to this variation.

SMART is an extremely influencial and widely used software system for investigating IR techniques [REF153] [REF869] . One secret of its success is that SMART provides a simple parameter-driven mechanism for easily changing from one form of index weighting to another.

In SMART, the weight is decomposed into three factors:

Each of these components can then be specified independently:

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