Frequently Asked Questions

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What kind of test was used to identify untypical levels?

Each data series was analyzed by comparing the September and October 2001 levels to a range of typical levels as determined by a t-statistic. The option was applied to those data series with September or October levels that were outside of the typical range and for which there was an independent indication of an impact due to the September events.

For more information, visit the Monthly and Annual Retail Trade website.


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