Was the option that was altered developed specifically to handle the impact of the automobile incentives?
No. This option is used as a part of standard seasonal adjustment procedures at the Census Bureau but with a more conservative (restrictive) definition of what constitutes an atypical month. This month, a definition of atypical was used that is customary in statistical practice when there is advance knowledge that the month's survey value has a strong potential to be atypical.
For more information, visit the Monthly and Annual Retail Trade website.