Patent attributes
Methods, apparatus, systems and articles of manufacture to count people in an audience are disclosed. An apparatus includes a location determiner to determine a location of a portable device was outside of a media exposure environment, and a proximity determiner to determine a person was in proximity to the portable device. The apparatus also includes a presence detector to: generate first presence information based on the location of the portable device and the proximity of the person to the portable device, the first presence information to indicate that the person was absent from the media exposure environment; compare the first presence information to second presence information collected by a people meter; and, when the second presence information indicates the person was present in the media exposure environment, modify the second presence information based on the first presence information.
