In addition to relevance, there are other factors that contribute to the utility of a document. For examples, content properties like depth of analysis and multiplicity of viewpoints, and presentational properties like readability and verbosity, all will affect the usefulness of a document. These kinds of relevance-independent properties are difficult to determine, as their estimations are more likely to be affected by personal aspects of one's knowledge structure. Reliability of judgments on those properties may decrease when one moves from the personal level to the global level. In this paper, we report several experiments on document qualities. In our experiments, we explore the correlation of judgments on nine different document qualities to see if we can generate fewer dimensions underlying the judgments. We also investigate the issue of reliability of the judgments and discuss its theoretical implications. We find that, between the global level of agreement of judgment and the inter-personal level of agreement of judgment, there is an intermediate level of agreement, which can be characterized as an inter-institutional level.
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