use and modification of default spfs in the ihsdm mike dimaiuta lendis corporation
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Use and Modification of Default SPFs in the
IHSDM
Mike DimaiutaLENDIS Corporation
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Options for using SPFs in IHSDM
• Use Default SPFs “as is”• Calibrate models, including SPFs• Enter and use “your own” SPFs
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Use Default SPFs “as is”
• Run IHSDM Crash Prediction Module (CPM) without calibrating (i.e. with calibration factors = 1.0)
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Use Default SPFs
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Use Default SPFs “as is”
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Calibrate Models / SPFs
• Follow HSM Part C calibration procedure and enter factors via IHSDM Administration Tool
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Calibrate Models / SPFs
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Calibrate Models / SPFs
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Calibrate model / SPFs
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Calibrate model / SPFs
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Enter and use “your own” SPFs
• Via the IHSDM Administration Tool:– “Crash Prediction” >• “Model Data Sets”
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Enter and use “your own” SPFs
• Capabilities:– For all SPFs, can change:• Regression coefficients• Overdispersion parameters
• Limitation:– Can not change SPF functional form
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Enter and use “your own” SPFs
• After editing data, save as a new Model Data Set “configuration” and select when running CPM
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Enter and use “your own” SPFs
• Example: Multilane Rural H’way– Estimate crashes using defaults– Enter “My State’s SPFs” into
Administration Tool– Run CPM with modified SPFs to
generate and compare results
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Estimate crashes using default SPFs
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Enter “My State’s” SPFs into Administration Tool
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Enter “My State’s” SPFs into Administration Tool
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Enter “My State’s” SPFs into Administration Tool
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Run CPM with modified SPFs
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Compare Results
• Estimated Total crashes using default SPFs: 27.84
• Estimated Total crashes using “My State’s” SPFs: 27.62
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Summary
• No requirement for agencies to develop their own SPFs for IHSDM, but…
• IHSDM provides a mechanism for agencies to edit all default SPFs (coefficients and overdispersion parameters only)
• Either way can produce good results!
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Questions?
For additional information:www.tfhrc.gov/safety/ihsdm/ihsdm.htm
IHSDM Technical Support: [email protected]; (202)-493-3407
To download IHSDM software: www.ihsdm.org
Shyuan-Ren (Clayton) [email protected]; (202)-493-3054