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The reports on this page describe usage of individual articles at the Journal of Vision from October 23, 2003 up to the recording date, which is indicated in each report. Usage is derived from Journal of Vision server web logs. The usage statistic employed here is unique PDF article downloads. A unique download is defined as the first complete PDF download by a unique user of a particular article.
Unique users are identified by a variety of methods, including IP addresses, user-agents, and cookies. Downloads are not recorded for users who have disabled cookies or javascript. Downloads by robots and spiders are excluded.
For each article, we construct the trace: a graph of the cumulative unique downloads versus time since the day of publication. From the trace we compute several metrics. The InitialRate is the downloads/day over the first 90 days (up to the "corner"). The CurrenRate is the downloads/day over the 30 days preceeding the recording date. The DemandFactor is an estimate of the downloads/day over the first 1000 days since publication. DemandFactor is derived from a curve fit to the trace over the interval following the corner.
TotalDownloads is the total number of unique downloads over the recording interval.
DemandFactor is underestimated for papers published before the start of our logs, and for this reason is reported for those papers with the symbol ">". We do not compute InitialRate for papers less than 90 days old, and we do not compute DemandFactor for papers less than 365 days old. We do not compute current rate for papers that are less than 120 days old.
The sections above provide tables of the top 20 articles as ranked by DemandFactor or by TotalDownloads, and an interface to browse the report for a single article. We also provide information regarding the distribution of DemandFactor and TotalDownloads.
These reports are compiled approximately monthly. We welcome any reports of errors or inconsistencies.
We caution the reader that the specific statistics we have chosen to compute are not the only ones we could have chosen. In the future we may choose different statistics, or may discontinue download reports.
Further, our statistics suffer from limitations as noted above.
Nevertheless, we feel they are a useful starting point in a new era of publication of dynamic meta-information about articles.
So far as we are aware, the Journal of Vision is the first publication to make current usage statistics available for individual articles. We believe this is useful information, for both authors and readers.
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