8. An apparatus comprising: an audience measurement engine to collect an audience measurement parameter for a presented program; an indexing engine to create a keyword database based on data descriptive of a plurality of programs; and a closed caption matcher to: generate likelihood values for respective ones of the plurality of programs based on comparison of closed caption text associated with the presented program to the keyword database, the values representing likelihoods that the respective ones of the plurality of programs is the presented programs, the likelihood values being generated without comparing the collected audience measurement data to any reference audience measurement data; select a subset of the plurality of programs based on the likelihood values to form a list of most probable presented programs, the list of most probable presented programs including more than one of and fewer than all of the plurality of programs; order the list of most probable presented programs based on respective ones of the likelihood values; and send the ordered list of most probable programs and the collected audience measurement data to a collection server, the collection server to compare the collected audience measurement data to reference audience measurement data for respective ones of the most probable programs based on the order of the most probable programs in the list to determine an audience presentation statistic, wherein at least one of the audience measurement engine, the indexing engine or the closed caption matcher is implemented in hardware.
8. An apparatus comprising: an audience measurement engine to collect an audience measurement parameter for a presented program; an indexing engine to create a keyword database based on data descriptive of a plurality of programs; and a closed caption matcher to: generate likelihood values for respective ones of the plurality of programs based on comparison of closed caption text associated with the presented program to the keyword database, the values representing likelihoods that the respective ones of the plurality of programs is the presented programs, the likelihood values being generated without comparing the collected audience measurement data to any reference audience measurement data; select a subset of the plurality of programs based on the likelihood values to form a list of most probable presented programs, the list of most probable presented programs including more than one of and fewer than all of the plurality of programs; order the list of most probable presented programs based on respective ones of the likelihood values; and send the ordered list of most probable programs and the collected audience measurement data to a collection server, the collection server to compare the collected audience measurement data to reference audience measurement data for respective ones of the most probable programs based on the order of the most probable programs in the list to determine an audience presentation statistic, wherein at least one of the audience measurement engine, the indexing engine or the closed caption matcher is implemented in hardware. 13. An apparatus as defined in claim 8 , wherein the list further includes at least one of a most probable channel or a most probable time.