I don't get where transportation data collection invades people's privacy. People generally fill out travel surveys with no problems.

>>> "Srinivasan, Nanda" <NSrinivasan@nas.edu> 6/8/2009 1:50 PM >>>

I am pleased to provide an electronic copy of the latest final report in
the NCHRP 08-36 series on Task 71: Disclosure Avoidance Techniques to
Improve ACS Data Availability for Transportation Planners. The report is
posted at http://www.trb.org/NotesDocs/NCHRP08-36(71)_FR.pdf.  The
report was prepared by Cambridge Systematics. 

Abstract: Data dissemination rules initiated by the DRB caused
significant loss of data for CTPP 2000, and are expected to cause an
even more serious loss when applied to products emanating from the
American Community Survey.  This report summarizes the development and
testing of synthetic data techniques that the Census Bureau could employ
to provide alternative data, particularly in regards to journey-to-work
flow data at small geography from the Decennial Census (or from the
5-year accumulation of the American Community Survey).  Multi-year ACS
data tables are inherently protected from potential harmful disclosure
of participants, and therefore do not require further disclosure
restrictions.  However, if disclosure-proofing is nevertheless deemed
necessary, using a form of data synthesis is probably the best approach
from the viewpoint of the transportation planning data user.  This
research examines alternative data synthesis approaches that could be
employed for multi-year ACS journey-to-work tables, including iterative
proportional fitting, combined Bayesian/iterative proportional fitting,
and the Generalized Shuttle Algorithm.

Disclaimer: This project was conducted at the request of the AASHTO
Standing Committee on Planning as part of NCHRP Project 08-36.  Please
note that the report did not go through the usual rigorous review
process established and monitored by the Transportation Research Board
Executive Committee or the Governing Board of the National Research
Council, and should not be referred to as a "TRB Report". It should be
described as a contractor's report conducted for the AASHTO Standing
Committee on Planning with funding provided through the National
Cooperative Highway Research Program Project 08-36. 

Regards,
Nanda Srinivasan

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