
 Term          Contrast Estimate Std. Error     z Pr(>|z|)    5.0 %  95.0 %
   hp       mean(dY/dX)   -0.024     0.0154 -1.56 0.118721  -0.0494  0.0013
  cyl mean(6) - mean(4)   -5.968     1.6393 -3.64 0.000272  -8.6640 -3.2713
  cyl mean(8) - mean(4)   -8.521     2.3261 -3.66 0.000249 -12.3469 -4.6948

Prediction type:  response 
Columns: type, term, contrast, estimate, std.error, statistic, p.value, conf.low, conf.high 

