"Conditional attribute: attributes only displayed with a particular level or levels of the primary attribute."
"You can specify two-way interactions for alternative-specific designs during analysis, though in our example it doesn't make sense to specify two-way interactions between primary and conditional attributes, since the effects measured are already "specific" to the reference levels of the primary attribute. However, for this example design, it is possible to study the interaction between the frequency of bus pick-up and the cost per bus trip, since these two attributes always were displayed together within concepts (and no prohibitions involving these two attributes were specified). If a common attribute were defined (applying to all levels of the primary attribute), it is possible to specify other interactions, such as between the primary and common attribute."
But what about interactions between conditional attributes that occur within different alternatives? Are those possible to detect in lighthouse?