Methods, apparatus, and articles of manufacture to determine whether audience measurement meters are co-located

A non-transitory machine readable storage medium comprising instructions that, when executed, cause processor circuitry to at least:

• based on a difference between a first sampling time of a first entry of a first log and a second sampling time of a corresponding entry of a second log satisfying a first threshold, determine at least one matching instance of at least one first device identifier of the first entry and at least one second device identifier of the corresponding entry;
• populate a variable with the at least one matching instance, the variable corresponding to a first meter and a second meter;
• and
• based on a metric satisfying a second threshold, cause transmission of an alert indicating that the first meter and the second meter were co-located during generation of the first log and the second log, the metric based on the at least one matching instance.

A method to determine whether audience measurement meters are co-located, the method comprising

• based on a difference between a first sampling time of a first entry of a first log and a second sampling time of a corresponding entry of a second log satisfying a first threshold, determining, by executing an instruction with processor circuitry, at least one matching instance of at least one first device identifier of the first entry and at least one second device identifier of the corresponding entry;
• populating, by executing an instruction with the processor circuitry, a variable with the at least one matching instance, the variable corresponding to a first meter and a second meter;
• and
• based on a metric satisfying a second threshold, transmitting an alert indicating that the first meter and the second meter were co-located during generation of the first log and the second log, the metric based on the at least one matching instance.