Thanks Liang for sharing the slides, much appreciated,very interesting presentation on a proposed metholodology for using larger area ACS estimates (themselves with a fairly large margin of error, as we know) to synthesize to PUMAs, which are themselves large area geography.  However no margins of error are addressed that I can see in the presentation, though the last slide has as “next steps” an item that proposes inquiry into census block groups and census tracts.  One potential issue is where do the controls for the small-area data come from if we are somehow coming up with the controls themselves, and then synthesizing cross-tabs from those controls.

Among other things, margins of errors are something to keep in mind for NCHRP 08-79.

Thanks,

Guy

Guy Rousseau

Modeling Manager

Atlanta Regional Commission

From: ctpp-news-bounces@chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Liang Long
Sent: Thursday, February 25, 2010 10:50 AM
To: ctpp-news@chrispy.net
Subject: [CTPP] Sakshaug's slides on CS FTP server

As many of you are requiring Joe's research materials, I asked Joe's approval for sharing his presentation slides.  Here it is:

ftp://ftp.camsys.com/temp/outgoing/CTPP/JoeSakshaug_Synthetic.pdf

Liang Long
Cambridge Systematics, Inc.
4800 Hampden Lane
Suite 800
Bethesda, MD 20814
tel  301 347 9141
fax 301 347 0101
FHWA 202-366-6971
e-mail  llong@camsys.com
www.camsys.com