  Which and how many attributes are relevant for the sorting of agents in a
matching market? This paper addresses these questions by constructing indices
of mutual attractiveness that aggregate information about agents' attributes.
The first k indices for agents on each side of the market provide the best
approximation of the matching surplus by a k-dimensional model. The methodology
is applied on a unique Dutch households survey containing information about
education, height, BMI, health, attitude toward risk and personality traits of
spouses.
