How is the design of the Library Journal (LJ) Index of Public Library Service holding up over time?
As noted in the initial article that proposed the LJ Index [insert link], its statistical design will be re-analyzed and reviewed at regular intervals. Now that there are three annual editions of the LJ Index, it is a propitious time for such an examination. When creating an index, such as the LJ Index, the most appropriate relationships to examine are the bivariate relationships between the potential component measures. Such an analysis was included in that first LJ Index article. Now that the index exists, the most appropriate relationships to examine are those between the Index’s four component measures-the four service output per capitas-and the index score itself. The acid test of an existing index is the extent to which each of its components continues to contribute substantially to its scores.
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