year*carb*pre 0.346 0.801 (0.093)** (0.045)** year*carb*post 0.858 0.442 (0.090)** (0.043)** year*Efi -0.093 0.382 (0.028)** (0.015)** carb*pre -664.082 (183.870)** carb*post -1,678.162 (89.347)** (178.155)** -826.419 Efi 210.245 (85.464)** (54.682)** -707.710 weight (28.786)** -0.006 power (0.000)** -0.037 auto (0.001)** -1.254 enginecc (0.057)** 0.000 Model degrees of 6 (0.000)** freedom 27 10 Residual degrees of 10,505 27 freedom 0.93 10,505 Observations 0.97 Adjusted R2 Notes: * p < 0.05, ** p < 0.01. Robust standard errors in parentheses. Standard errors adjusted for 27 automobile brand clusters. Coefficient estimates for interacted variables are interpretable without being added to other coefficients. The interacted variables create mutually exclusive and exhaustive categories for the observations in the data. Table 5. Second stages of 2SLS regressions for last gasps dependent variable: MPG (3) (4) (5) year*carb*pre 1.217 1.231 (0.071)** (0.072)** year*carb*pre*pure 1.023 (0.168)** year*carb*pre*mixed 1.233 (0.074)** year*carb*post 1.483 (0.125)** year*carb*post*ffs 1.903 (0.187)** year*carb*post*notffs 0.729 (0.144)** year*carb*post*ffs*pure 0.550 (0.197)** year*carb*post*ffs*mixed 1.951
year*carb*pre year*carb*post year*Efi carb*pre carb*post Efi weight power auto enginecc Model degrees of freedom Residual degrees of freedom Observations Adjusted R2 0.346 (0.093)** 0.858 (0.090)** -0.093 (0.028)** -664.082 (183.870)** -1,678.162 (178.155)** 210.245 (54.682)** 6 27 10,505 0.93 0.801 (0.045)** 0.442 (0.043)** 0.382 (0.015)** (89.347)** -826.419 (85.464)** -707.710 (28.786)** -0.006 (0.000)** -0.037 (0.001)** -1.254 (0.057)** 0.000 (0.000)** 10 27 10,505 0.97 Notes: * p < 0.05, ** p < 0.01. Robust standard errors in parentheses. Standard errors adjusted for 27 automobile brand clusters. Coefficient estimates for interacted variables are interpretable without being added to other coefficients. The interacted variables create mutually exclusive and exhaustive categories for the observations in the data. Table 5. Second stages of 2SLS regressions for last gasps dependent variable: MPG (3) (4) (5) year*carb*pre year*carb*pre*pure year*carb*pre*mixed year*carb*post year*carb*post*ffs year*carb*post*notffs year*carb*post*ffs*pure year*carb*post*ffs*mixed 1.217 (0.071)** 1.483 (0.125)** 1.231 (0.072)** 1.903 (0.187)** 0.729 (0.144)** 1.023 (0.168)** 1.233 (0.074)** 0.550 (0.197)** 1.951
Furr%20and%20Snow_Last%20Gasp_SMJ%20Submission%20Full%20Document.docx