Meta-Regression Rating Fields

Rating InputsRating Outputs
Included studies applied the same methodology and accounted for the same confounding factors, including: RTM, Traffic volume changes, Tiem trends, and Crash migration/spillover effects, if applicable. Some Rating for study methodoligies accounted for. 10
Crash type and severity definitions consistent between outcome measures of studies yes Rating for crash type and severity definition consistency. 20
Treatment was applied similarly between locations or accounted for in the model. yes Rating for estimate consistency. 10
Publication bias was tested for and addressed if present. yes Rating for publication bias tested. 5
A majority of studies used are deemed acceptable by the NCHRP 17-72 rating scheme. yes Rating for NCHRP 17-72 acceptable ratin scheme. 25
The standard error of at least one of the CMFs is less than or equal to 0.10. yes Rating for standard error of CMFs. 10
A test of homogeneity indicates that the CMF estimates can be combined. yes Rating for test of homogeneity. 10
Appropriate model form including error terms applied. yes Rating for appropriate model form. 10
Appropriate functional form applied. yes Rating for appropriate funcional form. 10
Consideration of omitted variable bias, considered through design or included in model. yes Rating for consideration of omitted variable bias. 10
Consideration of correlation between independent variables. yes Rating for consideration of correlation. 10
Considered the possible impacts of country of study origin and year. yes Rating for possible impacts of country of study. 10
    RATING TOTAL 140

Read more about how the Star Quality Rating scores are determined.