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Activity Number:
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255
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Type:
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Contributed
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Date/Time:
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Tuesday, August 13, 2002 : 2:00 PM to 3:50 PM
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Sponsor:
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Section on Survey Research Methods*
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| Abstract - #301087 |
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Title:
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The New Sample Design for the EIA-878 Motor Gasoline Price Survey
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Author(s):
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Pedro Saavedra*+ and Benita O'Colmain and Ewa Carlton and Paula Weir and Tracy Churchill
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Affiliation(s):
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ORC Macro and ORC Macro and ORC Macro and U.S. Department of Energy and ORC Macro
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Address:
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11785 Beltsville Dr., Calverton, Maryland, 20705, USA
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Keywords:
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area sample ; counties ; weighting ; allocations ; sampling ; petroleum
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Abstract:
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The EIA-878 is a survey of motor gasoline outlet prices that produces estimates of national and regional level prices, as well as separate estimates for several states and cities: two formulations and three grades of gasoline. Up to recently, this survey has used a monthly survey of resellers and refiners as Phase I of a multi-phase sample, subsampling the sample units of the monthly survey that report the specific outlet sales category and sampling stations owned by those units. A new design extends coverage to independent stations and targets additional states and cities. The design is an area sample that uses data from several sources, allocating stations to counties and sampling stations from the selected counties. Several data sources are used for analytic purposes and to obtain allocations and size measures. Weights make use of the number of places at which gas may be pumped as a proxy for volume and the proportion of gas by grade in the state. Populations of stations are obtained from the 1999 County Business Patterns. Unit variances for sampling purposes are obtained from the previous cycle. Actual listings are obtained from a commercial vendor.
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