Graphics Reference
In-Depth Information
Figure
.
.
Data and fitted regression functions in the leaf nodes of the tree model in Fig.
.
, using
different symbols for
barrig
(top)and
airbag
(bottom)values
Another variable confounded with
vehspd
is
airbag
. his can be seen in the
second row of plots in the same figure, where different symbols are used to indicate
whether a vehicle is equipped with an airbag or not. We see that almost all vehicles
manufactured from
onwards have airbags and that their presence is associated
