Transportation Service Index and Seasonally-Adjusted Transportation Data
Principal Investigator(s): View help for Principal Investigator(s) United States Department of Transportation. Research and Innovative Technology Administration. Bureau of Transportation Statistics
Version: View help for Version V1
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Project Citation:
United States Department of Transportation. Research and Innovative Technology Administration. Bureau of Transportation Statistics. Transportation Service Index and Seasonally-Adjusted Transportation Data. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2025-04-15. https://doi.org/10.3886/E226822V1
Project Description
Project Title:
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Transportation Service Index and Seasonally-Adjusted Transportation Data
Summary:
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The Transportation Services Index (TSI), created by the U.S. Department of Transportation (DOT), Bureau of Transportation Statistics (BTS), measures the movement of freight and passengers. The index, which is seasonally adjusted, combines available data on freight traffic, as well as passenger travel, that have been weighted to yield a monthly measure of transportation services output.
For charts and discussion on the relationship of the TSI to the economy, see the Transportation as an Economic Indicator: Transportation Services Index page (https://data.bts.gov/stories/s/TET-indicator-1/9czv-tjte).
Statisticians use the process of seasonal-adjustment to uncover trends in data. Monthly data, for instance, are influenced by the number of days and the number of weekends in a month as well as by the timing of holidays and seasonal activity. These influences make it difficult to see underlying changes in the data. Statisticians use seasonal adjustment to control for these influences.
Controlling of seasonal influences allows measurement of real monthly changes; short and long term patterns of growth or decline; and turning points. Data for one month can be compared to data for any other month in the series and the data series can be ranked to find high and low points. Any observed differences are “real” differences; that is, they are differences brought about by changes in the data and not brought about by a change in the number of days or weekends in the month, the occurrence or non-occurrence of a holiday, or seasonal activity.
For charts and discussion on the relationship of the TSI to the economy, see the Transportation as an Economic Indicator: Transportation Services Index page (https://data.bts.gov/stories/s/TET-indicator-1/9czv-tjte).
Statisticians use the process of seasonal-adjustment to uncover trends in data. Monthly data, for instance, are influenced by the number of days and the number of weekends in a month as well as by the timing of holidays and seasonal activity. These influences make it difficult to see underlying changes in the data. Statisticians use seasonal adjustment to control for these influences.
Controlling of seasonal influences allows measurement of real monthly changes; short and long term patterns of growth or decline; and turning points. Data for one month can be compared to data for any other month in the series and the data series can be ranked to find high and low points. Any observed differences are “real” differences; that is, they are differences brought about by changes in the data and not brought about by a change in the number of days or weekends in the month, the occurrence or non-occurrence of a holiday, or seasonal activity.
Original Distribution URL:
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https://data.bts.gov/Research-and-Statistics/Transportation-Services-Index-and-Seasonally-Adjus/bw6n-ddqk/about_data
Scope of Project
Subject Terms:
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transportation;
seasonal;
traffic;
vehicles;
rail;
truck;
freight;
highways
Geographic Coverage:
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United States
Time Period(s):
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2000 – 2025
Universe:
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Data on freight traffic, as well as passenger travel, that have been
weighted to yield a monthly measure of transportation services output
Data Type(s):
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administrative records data;
aggregate data;
event/transaction data
Methodology
Data Source:
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Bureau of Transportation Statistics, U.S. Department of Transportation
Weights:
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Weighted to yield a monthly measure of transportation services output
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