Methods and apparatus for determining audience metrics across different media platforms

1. An apparatus to determine media access sessions, comprising:

a record locator to access, in a data store, a first media impression record indicative of a first media access segment including a first start time and a first end time, and a second media impression record indicative of a second media access segment including a second start time and a second end time, the first and second media access segments corresponding to media presented via a media presentation device; and

a view counter to:

determine a time period separating the first and second media access segments, the time period defined by the first end time of the first media access segment and the second start time of the second media access segment, the time period defining a duration during which the media was not presented at the media presentation device between the first and second media access segments;

when the time period separating the first and second media access segments does not exceed a threshold, update at least one of the first media impression record or the second media impression record in the data store to indicate that the first and second media access segments are associated with a same first media access session, the threshold corresponding to a maximum duration between adjacent media access segments for the adjacent media access segments to be considered part of a same media access session; and

when the time period separating the first and second media access segments exceeds the threshold, update the second media impression record to indicate an association between the second media access segment and a second media access session, the second media access session being different from a first media access session corresponding to the first media access segment, at least one of the record locator or the view counter is implemented by a logic circuit.

2. The apparatus as defined in claim 1 , wherein the view counter includes a view start designator to designate the first media access session as a first view start and to designate the second media access session as a second view start.

3. The apparatus as defined in claim 1 , wherein, when at least one of the first media access session or the second media access session has a duration that extends beyond a day boundary, the view counter is to:

attribute the at least one of the first media access session or the second media access session to a first day;

determine a first day duration of the at least one of the first media access session or the second media access session, the first day duration corresponding to first media accessed during the first day; and

determine a second day duration of the at least one of the first media access session or the second media access session, the second day duration corresponding to second media accessed during a second day.

4. The apparatus as defined in claim 1 , wherein at least one of the first media access session or the second media access session is a combination of a plurality of media access segments.

5. The apparatus as defined in claim 1 , wherein the first media access segment corresponds to a duration during which a person is identified as having accessed corresponding media.

6. The apparatus as defined in claim 1 , wherein the first media access segment and the second media access segment include at least one of content, an advertisement, a program, a movie, a radio program or a television program.

7. The apparatus as defined in claim 1 , further including:

a viewing segment sorter to determine a first media identifier, a first duration, and a first type for the first media access segment, and to determine a second media identifier, a second duration, and a second type for the second media access segment; and

a viewing segment classifier to associate the first media identifier, the first duration, and the first type with the first media impression record, and to associate the second media identifier, the second duration, and the second type with the second media impression record.

8. The apparatus as defined in claim 1 , wherein the view counter is to:

determine whether the first media impression record and the second media impression record represent one or more view starts, and

attribute to each view start a duration of any media impression record contributing to the corresponding view start.

9. A non-transitory computer readable storage medium comprising instructions that, when executed, cause a machine to at least:

access in a data store a first media impression record indicative of a first media access segment including a first start time and a first end time, and a second media impression record indicative of a second media access segment including a second start time and a second end time, the first and second media access segments corresponding to media presented via a media presentation device;

determine a time period separating the first media access segment and the second media access segment, the time period defined by the first end time of the first media access segment and the second start time of the second media access segment, the time period defining a duration during which the media was not presented at the media presentation device between the first and second media access segments;

when the time period separating the first and second media access segments does not exceed a threshold, update at least one of the first media impression record or the second media impression record in the data store to indicate that the first and second media access segments are associated with a same first media access session, the threshold corresponding to a maximum duration between adjacent media access segments for the adjacent media access segments to be considered part of a same media access session; and

when the time period separating the first and second media access segments exceeds the threshold, update the second media impression record to indicate an association between the second media access segment and a second media access session, the second media access session being different from a first media access session corresponding to the first media access segment.

10. The non-transitory storage medium as defined in claim 9 , wherein the instructions further cause the machine to designate the first media access session as a first view start and to designate the second media access session as a second view start.

11. The non-transitory storage medium as defined in claim 9 , wherein the instructions, when executed, cause the machine to, when at least one of the first media access session or the second media access session have a duration that extends beyond a day boundary:

attribute the at least one of the first media access session or the second media access session to a first day;

determine a first day duration of the at least one of the first media access session or the second media access session, the first day duration corresponding to first media accessed during the first day; and

determine a second day duration of the at least one of the first media access session or the second media access session, the second day duration corresponding to second media accessed during a second day.

12. The non-transitory storage medium as defined in claim 9 , wherein the first media access session includes a grouping of a plurality of media access segments.

13. The non-transitory storage medium as defined in claim 9 , wherein the first media access segment corresponds to a duration during which a person accesses an instance of media.

14. The non-transitory storage medium as defined in claim 9 , wherein the instructions, when executed, cause the machine to:

determine a first media identifier, a first duration, and a first type for the first media access segment;

associate the first media identifier, the first duration, and the first type with the first media impression record;

determine a second media identifier, a second duration, and a second type for the second media access segment; and

associate the second media identifier, the second duration, and the second type with the second impression record.

15. The non-transitory storage medium as defined in claim 9 , wherein the instructions further cause the machine to:

determine whether the first media impression record and the second media impression record represent one or more view starts, and

attribute to each view start a duration of any media impression record contributing to the corresponding view start.

16. A method to determine media access sessions, comprising:

accessing in a data store, a first media impression record indicative of a first media access segment including a first start time and a first end time representing exposure to watermarked media, and a second media impression record indicative of a second media access segment including a second start time and a second end time representing exposure to the same watermarked media, the first and second media access segments corresponding to media presented via a media presentation device;

determining, by executing an instruction with a processor, a time period separating the first and second media access segments, the time period defined by the first end time of the first media access segment and the second start time of the second media access segment, the time period defining a duration during which the media was not presented at the media presentation device between the first and second media access segments;

when the time period separating the first and second media access segments does not exceed a threshold, updating, by executing an instruction with the processor, at least one of the first media impression record or the second media impression record in the data store to indicate that the first and second media access segments are associated with a same first media access session, the threshold corresponding to a maximum duration between adjacent media access segments for the adjacent media access segments to be considered part of a same media access session; and

when the time period separating the first and second media access segments exceeds the threshold, updating, by executing an instruction with the processor, the second media impression record to indicate an association between the second media access segment and a second media access session, the second media access session being different from the first media access session, the first media access session corresponding to the first media access segment.

17. The method as defined in claim 16 , wherein the threshold represents a duration after which a person whom has ceased accessing a piece of media is unlikely to subsequently access the same piece of media.

18. The method as defined in claim 16 , further including, when at least one of the first media access session or the second media access session has a duration that extends beyond a day boundary:

attributing the at least one of the first media access session or the second media access session to a first day;

determining a first day duration of the at least one of the first media access session or the second media access session corresponding to first media accessed during the first day; and

determining a second day duration of the at least one of the first media access session or the second media access session corresponding to second media accessed during a second day.

19. The method as defined in claim 16 , wherein the first media access session corresponds to a group of a plurality of media access segments.

20. The method as defined in claim 16 , wherein the first media access segment is associated with a duration during which a person is identified as having accessed a same piece of media.

21. The method as defined in claim 16 , wherein the same media includes at least one of content or an advertisement.

22. The method as defined in claim 16 , wherein the first media impression record includes a first media identifier, a first duration, and a first type for the first media access segment, and the second media impression record includes a second media identifier, a second duration, and a second type for the second media access segment.

23. The method as defined in claim 16 , further including:

determining whether the first media impression record and the second media impression record represent one or more view starts, and

attributing to each view start a duration of any media impression record contributing to the corresponding view start.