Abstract: Methods, apparatus, systems and articles of manufacture are disclosed to determine headroom. An example apparatus disclosed herein includes a data retriever to retrieve a first data set and a second data set, the first and second data sets including observations, an overlap calculator to merge respective ones of the observations to form an overlap data set, the respective ones of the observations merged based on first tier parameters, a similarity calculator to calculate similarity scores for pairs of the respective ones of the observations in the overlap data set, the similarity score based on second tier parameters, and a data joiner to associate respective ones of the similarity scores with corresponding households associated with the respective ones of the observations.

Abstract: Systems and methods to select targeted advertising for display are disclosed. An example method to select targeted advertising for display includes identifying an advertisement corresponding to the first product, identifying a saturation metric for the advertisement, determining a net effectiveness metric based on an opportunity metric and the saturation metric, the opportunity metric being based on a difference between an expected consumption of a first product by the household and actual consumption of the product by the household, and delivering the advertisement to the household via a media transmission when the net effectiveness metric is greater than a threshold.