data("TravelMode")
mode
.
1
to 200
."car"
, "air"
, "train"
, or "bus"
."no"
and "yes"
.In MRSP
-terminology, variables wait
, vcost
, travel
and gcost
are
category-specific since they take different values for different categories of mode
. The variables
income
and size
are global. In the literature on discrete choice modelling,
these two variable types are called alternative-specific and individual-specific, respectively.