This question has probably been asked before, but I don't recall the answer...

What sort of adjustments do people make with CTPP data, to deal with the extreme "long-distance" commuters that are actually just "temporarily re-assigned" workers?  This is not an error in the CTPP collection or summary process, but rather a result of the way the long form questions were answered.

For example, here is a record that got "expanded" to four people:
-- The Place of Residence is a County in Alaska
-- The Place of Work is a County in Texas (Dallas)
-- The commute time is 20 minutes

What this is saying is that the person isn't really commuting each day from their home in Alaska, but is instead commuting to a place in Dallas County from some temporary residence (a hotel, perhaps) within the Dallas-Fort Worth area.

Such an extreme example is easy to recognize, but what about other examples which fall into the "not sure" category when it comes to whether a person's normal place of residence is really the point where they are truly starting their commute trip?  Perhaps a very high "average speed" based on "travel time" and "straight-line distance" could be used to flag such records?

Ken Cervenka
North Central Texas COG

-----Original Message-----
From: Pheny Smith [mailto:pheny.smith@bts.gov]
Sent: Thursday, May 06, 2004 11:04 AM
To: ctpp-news@chrispy.net
Cc: Jeff Butler; Deepak Virmani; Cheryl Young
Subject: [CTPP] Release of CTPP Part 3 Flat ASCII files

** High Priority **

Dear CTPP Users,
 
Thanks to the BTS Transtats team's effort, the preliminary CTPP 2000 Part 3 files are now available for download via the BTS Transtats Website.  These files are in Flat ASCII File format. 

 
The website is: www.bts.gov, Click on Data, then on CTPP 2000.
 
 
For questions on the Flat ASCII files, please contact Nanda Srinivasan (Nanda.srinivasan@fhwa.dot.gov) or Clara Reschovsky (Clara.a.reschovsky@census.gov).

 
For problems on downloading files, please contact Deepak Virmani (Deepak.virmani@bts.gov).
 
 
Pheny Smith, Ph. D.
Statistician
Office of Advanced Studies
Bureau of Transportation Statistics
(202) 366-2817