CTPP Data Products

Proposed Means of Transportation To Work Revised Options and Collapsing Schema CTPP

March 12, 2009

10 Categories	6 Categories	5 Categories	3 Categories
Drove Alone	Drove Alone	Drove Alone	Drove Alone
Carpool 2	Carpool 2 +	Carpool 2	Carpool 2+
Carpool 3 +	Carpool 2 +	Carpool 3+	Carpool 2+
Bus	Public Transportation	Public Transportation, Bike, Walk, Taxi, Motorcycle and Other Method	Public Transportation, Bike, Walk, Taxi, Motorcycle, Other Method and Worked At Home
Streetcar, Subway Elevated
Railroad, Ferry
Bicycle	Bike and Walk
Walk	Bike and Walk
Taxi, Motorcycle, Other Method	Taxi, Motorcycle Other Method
Worked at Home	Worked at Home	Worked at Home

Note:

In the CTPP tables, these versions end up with +1 for the Total line, so that the 10 category version is called Means11, 6 becomes Means7, 5 becomes Means6 and 3 becomes Means4.
Different collapsing structures were defined to the probability of data suppression. Some areas with little or no public transit would prefer to have carpooling 2 and Carpooling 3+ separate.
In the CB Table naming, C stands for 6 categories, C2 for 5 categories and C3 for 3 categories. For example:
Table 13211: Table with 10 categories Means of Transportation to Work
Table 13211C: Table with 6 categories Means of Transportation to Work
Table 13211C2: Table with 5 categories Means of Transportation to Work
Table 13211C3: Table with 3 categories Means of Transportation to Work
There are a few tables that use Means18 (full 17 categories + total). This is mainly for the Univariate tables, and some of the travel time x means of transportation crosstabs. In the latter case, the collapses with Means18 are suffixed with "C0", e.g. 12228C0. Please refer below for a full list of 18 categories.

18 Categories
Total, means of transportation
Car, truck or van – Drove alone
Car, truck, or van – In a 2-person carpool
Car, truck, or van – In a 3-person carpool
Car, truck, or van – In a 4-person carpool
Car, truck, or van – In a 5-or-6-person carpool
Car, truck or van – In a 7-or-more-person carpool
Bus or trolley bus
Streetcar or trolley car
Subway or elevated
Railroad
Ferryboat
Bicycle
Walked
Taxicab
Motorcycle
Other means
Worked at home