Methods and apparatus to create a panel of media device users

1. An apparatus comprising:

at least one processor; and

memory including machine readable instructions that, when executed by the at least one processor, cause the at least one processor to implement:

an interface to receive a unique identifier and an application identifier from a media device executing an instrumented application, the unique identifier and the application identifier received without collecting any personally identifiable information;

a panel creator to create a master frame corresponding to media devices that have executed the instrumented application; and

a registration data controller to: (i) determine a skip rate representing a rate at which media devices in the master frame are to be selected to join a panel, (ii) assign the media device from the master frame into a first test cell based on a random value and the skip rate, (iii) select a first recruitment interface associated with the first test cell, the first recruitment interface different from a second recruitment interface associated with a second test cell, and (iv) instruct the instrumented application to, in response to the instrumented application being executed for a first time after a threshold period of time since an initial execution of the instrumented application has elapsed, display the first recruitment interface to a user associated with the selected media device requesting the user to join the panel.

2. The apparatus of claim 1 , wherein the instructions, when executed, cause the at least one processor to receive monitoring data from the instrumented application after the user has agreed to become a panelist.

3. The apparatus of claim 1 , wherein the instructions, when executed, cause the at least one processor to generate the unique identifier to be used by the media device.

4. The apparatus of claim 3 , wherein the instructions, when executed, cause the at least one processor to transmit the unique identifier to the media device.

5. The apparatus of claim 1 , wherein the application identifier is assigned to the instrumented application by at least one of the media provider or an application developer.

6. The apparatus of claim 1 , wherein the random value is less than or equal to the skip rate and greater than or equal to zero.

7. The apparatus of claim 1 , wherein the skip rate is based on a count of media devices in the master frame divided by a desired number of media devices for the panel.

8. The apparatus of claim 1 , wherein the instructions, when executed, cause the at least one processor to sort the master frame prior to selecting the media device from the master frame.

9. The apparatus of claim 8 , wherein the instructions, when executed, cause the at least one processor to sort the master frame based on a number of applications associated with respective media devices in the master frame.

10. The apparatus of claim 8 , wherein the instructions, when executed, cause the at least one processor to sort the master frame based on application identifiers respectively associated with respective media devices in the master frame.

11. An apparatus comprising:

means for receiving a unique identifier and an application identifier from a media device executing an instrumented application, the unique identifier and the application identifier received without collecting any personally identifiable information;

means for creating a master frame corresponding to media devices that have executed the instrumented application; and

means for controlling to: (i) determine a skip rate representing a rate at which media devices in the master frame are to be selected to join a panel, (ii) assign the media device from the master frame into a first test cell based on a random value and the skip rate, (iii) select a first recruitment interface associated with the first test cell, the first recruitment interface different from a second recruitment interface associated with a second test cell, and (iv) instruct the instrumented application to, in response to the instrumented application being executed for a first time after a threshold period of time since an initial execution of the instrumented application has elapsed, display the first recruitment interface to a user associated with the selected media device requesting the user to join the panel.

12. The apparatus of claim 11 , further including a means for accessing monitoring data from the instrumented application after the user has agreed to become a panelist.

13. The apparatus of claim 11 , further including means for generating the unique identifier to be used by the media device.

14. The apparatus of claim 13 , wherein the means for receiving is to transmit the unique identifier to the media device.

15. The apparatus of claim 11 , wherein the application identifier is assigned to the instrumented application by at least one of a media provider or an application developer.

16. The apparatus of claim 11 , wherein the random value is less than or equal to the skip rate and greater than or equal to zero.

17. The apparatus of claim 11 , wherein the skip rate is based on a count of media devices in the master frame divided by a desired number of media devices for the panel.

18. The apparatus of claim 11 , wherein the means for controlling is to sort the master frame prior to selecting the media device from the master frame.

19. The apparatus of claim 18 , wherein the means for controlling is to sort the master frame based on a number of applications associated with respective media devices in the master frame.

20. The apparatus of claim 18 , wherein the means for controlling is to sort the master frame based on application identifiers respectively associated with respective media devices in the master frame.