Total Length (mi)

• Total length of all segments for the agency listed (may include overlapping segments)

Total Travel Time, GTIS (min)

• Average total travel time for all segments as reported by the Gateway Traveler Information System (GTIS)

Total Travel Time, NPMRDS (min)

• Average total travel time for all segments as reported by the National Performance Management Research Data Set (NPMRDS)

Similarity 1 (%)

• Based on Normalized Root Mean Square Error (NRMSE)
• Shows how similar the values are / error in measurements

Similarity 2 (%)

• Based on Mean Absolute Percentage Error (MAPE)
• Shows how similar the values are / error in measurements
• Deviation between data points in terms of percentage, effected largely by overforecasts

Abnormality (%)

• Based on data lying outside of three standard deviations from the mean versus what would normally be expected
• Affected by GTIS and NPMRDS evenly

Association (%)

• Based on correlation coefficient between datasets
• Can you predict one value based on the other

Inequality (%)

• Based on Theil statistics for the data
• Suite of four statistics commonly used to compare travel time data
• Measuring covariance, variance, and bias

Bias (%)

• Based on Theil bias statistic only

Omission (%)

• Based on data availability
• Large amounts of unavailable data results in lower score

Overall (%)

• Weighted average of the seven intermediate statistics

Change From Last Month(%)

• Percent change in overall score from previous month