As always, some limitations apply. First, we have used a rather limited
set of contextual variables in our study. We have for example
excluded customer density and weather variables from the study.
Thus, no explicit conclusions about the effects of these factors should
be made from our study. However, underground cabling and coordinate
variables in practice already characterize these aspects of the operating
environment. Underground cabling is likely to correlate strongly with
population density. We considered only underground cabling variable
as the regulatory model in Finland includes only this variable.