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Effective Management of HPMS Sample Data: Insights from the 2004 Highway Information Seminar

This seminar held on November 17, 2004, in Rosslyn, VA, focused on the significance of HPMS sample management as an efficient alternative to complete data collection. It highlighted time and cost savings for providers and discussed the expanded samples used to represent the HPMS universe. Key topics included the need for active management to maintain statistical validity, risks of bias, and essential review practices. Attendees learned methods to adjust samples, utilizing various tools and resources, to ensure accurate data for funding, safety measures, and highway investment estimates.

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Effective Management of HPMS Sample Data: Insights from the 2004 Highway Information Seminar

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  1. HPMS Sample Management Highway Information Seminar Rosslyn, VA November 17, 2004

  2. Importance of HPMS Sample • Sample used in lieu of complete data collection • Time & money saving process for providers • Expanded sample used to represent HPMS universe • Sample data used to: • Apportion funds to States • Measure fatality & injury rates • Estimate highway investment needs for Congress • Measure progress in congestion mitigation • Basis for highway fund authorization & budget levels

  3. Why is sample management necessary? • Expanded sample used to represent HPMS universe • Road systems change over time • Traffic volumes change over time • Result: • Samples move among volume group strata • Impacts number of samples needed in each strata • Active sample management needed to maintain statistically valid sample

  4. What can happen to samples? • The sample may become biased • The sample segments may become too short • The sample may become non-representative

  5. How to manage the sample? • Perform regular sample reviews • Plot the samples on a State map • Check for clustering on the same facilities, within a county or district • Check for samples that are entirely on a structure • Review sampling procedures for bias

  6. How to manage the sample? (cont’d) • Run the HPMS Submittal Software Adequacy Reports • check for unsampled volume groups • check for oversampled volume groups • check for undersampled volume groups • minimum 3 samples • maximum expansion factor of 100.000

  7. Should see relatively low percentages.

  8. Adjusting the Sample • Add/delete samples as needed • all eligible segments are in the volume group for selection • use random process to select/delete samples • Adjust sample in timely manner prior to the next submittal cycle

  9. Useful Resources • HPMS CBT • “HPMS Sample Management” link: http://www.fhwa.dot.gov/ohpi/hpms/hpmspubs.htm • HPMS Field Manual • Contact: • Robert Rozycki– FHWA HQ • robert.rozycki@fhwa.dot.gov, Ph:202-366-5059

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