Please remove me from your  E-mail list, I retire Dec. 31, 2009

Donald A. Bubb, P.E; Chief

Transportation Planning and Traffic Engineering

York County Planning Commission

28 E. Market Street I York, Pa. 17401

Phone: 717.771.9870 I Fax: 717.771.9511

www.dbubb@ycpc.org

From: ctpp-news-bounces@chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Paul Reim
Sent: Wednesday, December 30, 2009 11:45
To: CTPP-News
Subject: [CTPP] estimating standard errors for 2000 CTPP data

I'm compiling some comparisons of 2006-08 ACS and 2000 Census data, and I'm looking for some guidance in estimating standard errors for 2000 CTPP tables. For the place of residence data, I have applied the estimation procedures outlined in the 2000 SF3 documentation:

    Unadjusted standard error:

        SE(Y) = sqrt(5*Y*(1-Y/N)),

    where N = size of publication area (total population) and Y = estimate of characteristic total

This value is then multiplied by a design factor determined by the state, sample rate and characteristic.

Are these methods also applicable to the workplace (CTPP part 2) tables? If so, what assumptions can I make about sample rates, and are the standard error design factors applicable to place of work statistics?

Any advice will be greatly appreciated.

----------------------------------------------------

Paul Reim

Chief Planner, Data Resources

Central Transportation Planning Staff

Boston Metropolitan Planning Organization

10 Park Plaza, Suite 2150

Boston, MA 02116-3968

Phone: (617) 973-8132

Fax:     (617) 973-8855