Bureau of Transportation Statistics (BTS)
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Table 2 - Results of Regression of Depreciation Cost

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Sample size: 217 Coefficients Value Standard error t-value Pr(>|t|)  
Intercept α0 6,240.356986 115.0817835 54.2254108 0.00  
m/a α1    0.1035028   0.0034358 30.1247472 0.00  
a α2  677.7279739  11.9850174 56.5479340 0.00 R2=0.94
uppercase c subscript {lowercase d} equal lowercase alpha subscript {0} plus (lowercase alpha subscript {1} times (lowercase m divided by lowercase a)) plus (lowercase alpha subscript {2} times lowercase a)