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Appendix 1
Documentation of the Data Series
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CSV |
Table Version
1. Air Revenue Passenger-Miles (RPM)
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Name of series |
Air Revenue Passenger-Miles (RPM) |
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Explanation |
One revenue passenger transported one mile |
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Source |
U.S. Department of Transportation, Bureau of Transportation Statistics, Office of Airline Information,
Air Carrier Traffic Statistics Monthly,
available at
http://www.bts.gov/oai
, January 1992 |
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Data format |
Preliminary data; seasonally adjusted (in thousands) |
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Publication date |
Available at the end of the month for the 2 previous months |
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Revisions |
The latest 12 months of data are preliminary |
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Comments |
Based on BTS Form 41 filed by large certificated air carriers |
2. National Transit Ridership
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Name of series |
National Transit Ridership |
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Explanation |
Estimated unlinked passenger trips |
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Source |
American Public Transportation Association (APTA),
APTA Quarterly Transit Ridership Report,
available at
http://www.bts.gov
since January 1992 |
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Data format |
Preliminary data; seasonally adjusted (in thousands of riders) |
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Publication date |
Available in the first day of each quarter for the 2 previous quarters |
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Revisions |
The latest 3 years of data are preliminary |
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Comments |
Includes ridership of commuter rail, heavy rail, light rail, and others |
3. Rail Revenue Passenger-Miles (RPM)
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Name of series |
Rail Revenue Passenger-Miles (RPM) |
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Explanation |
RPMs carried by Amtrak and Alaska Railroads |
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Source |
U.S. Department of Transportation, Federal Railroad Administration (FRA), Office of Safety Analysis,
FRA Accident/Incident Bulletin,
available at http://safetydata.fra.dot.gov/OfficeofSafety/Default.asp) |
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Data format |
Preliminary data; seasonally adjusted (in millions of riders) |
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Publication date |
Beginning of each month for previous 2 months |
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Revisions |
The latest 12 months of data are preliminary |
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Comments |
RPM for January 1980–December 1985 were estimated from data of revenue passengers, because empty trains were counted into RPM before that time |
4. Trucking Tonnage Index (TTI)
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Name of series |
Trucking Tonnage Index (TTI) |
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Explanation |
Truck loads |
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Source |
American Trucking Association (ATA),
Monthly Trucking Report
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Data format |
Index: 1996 = 100; monthly, seasonally adjusted and unadjusted |
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Publication date |
3rd of each month for the previous 2 months |
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Revisions |
The latest monthly data are preliminary |
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Comments |
Estimated from tonnage reported by ATA's members in 50 states |
5. Railroads Revenue Ton-Miles of Freight (RTMF)
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Name of series |
Railroads Revenue Ton-Miles of Freight (RTMF) |
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Explanation |
Carloads of 20 railroads (total containers and trailers) in the United States |
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Source |
Association of American Railroads,
Weekly Railroad Traffic,
available at http://www.bts.gov since the 1st week of 1996 |
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Data format |
Preliminary data; quarterly; seasonally adjusted (in billions) |
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Publication date |
Second month of each quarter for the 2 previous quarters |
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Revisions |
The latest 12 months of data are preliminary |
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Comments |
Monthly data were not available. We interpolated from the quarterly data; however, we expect to work with the monthly series soon. |
6. Total Internal Commerce Tonnage Indicator (TICTI)
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Name of series |
Total Internal Commerce Tonnage Indicator (TICTI), all commodities |
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Explanation |
Internal waterway tonnage of coal, petroleum and chemicals, and food and farm products; estimated from 11 key locks on 9 rivers |
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Source |
U.S. Army Corps of Engineers, Waterborne Commerce Statistics Center, available at
http://www.iwr.usace.army.mil/ndc/monthlyindicators.htm
, since January 1994 |
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Data format |
Preliminary data; seasonally adjusted (in millions of short tons) |
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Publication date |
The beginning of each month for the 2 previous months |
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Revisions |
The latest 12 months of data are preliminary |
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Comments |
The data do not include great lakes, coastal and deep-sea waterborne traffic, which are currently not available |
7. Air Revenue Ton-Miles of Freight and Mails (RTMFM)
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Name of series |
Air Revenue Ton-Miles of Freight and Mail (RTMFM) |
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Explanation |
Ton-miles of freight and express mail transported by the air industry |
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Source |
U.S. Department of Transportation, Bureau of Transportation Statistics, Office of Airline Information,
Air Carrier Traffic Statistics Monthly,
available at
http://www.bts.gov/oai
since January 1992 |
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Data format |
Preliminary data; seasonally adjusted (in thousands) |
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Publication date |
The end of the month for the 2 previous months |
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Revisions |
The latest 12 months of data are preliminary |
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Comments |
Based on BTS Form 41 filed by large certificated air carriers |
8. Index of Energy Movements by Pipeline (IEMP)
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Name of series |
Index of Energy Movements by Pipeline (IEMP) |
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Explanation |
Movements of crude oil and petroleum products between PADDs; Alaska field production and consumption of natural gas |
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Source |
U.S. Department of Energy, Energy Information Administration,
Petroleum Supply Monthly (for movements of crude oil and petroleum products) and
Monthly Energy Review
(for natural gas and Alaska field production) |
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Data format |
Final data; seasonally adjusted (in millions of tons) |
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Publication date |
23rd–26th of each month for the 2 previous months |
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Revisions |
No revision |
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Comments |
Before January 1985, movements of crude oil between PADDs were not included in the total. In constructing IEMP, crude oil and petroleum products are in million barrels per day and natural gas is in cubic feet and are converted into tons using conversion factors. Conversion factors: 1 cubic foot of natural gas = 1,020 Btu (heat unit); 1 million Btu = 0.025 tons of oil equivalent; 1 barrel of petroleum products = 5.326 millions of Btu (heat unit). |
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