* Calculate a Participant Identification Code (PIC) checksum for each participant. If you give the participant your contact information, the name of the experiment, the PPN and their PIC, they will be able to prove that they participated in your experiment and you can identify the data that they supplied. Especially if your PPN has a fixed length you can give them a concatenation of PPN and PIC. If for instance the PPN is 1234 and the PIC is A3D4 then you simple send them the following text: | * Calculate a Participant Identification Code (PIC) checksum for each participant. If you give the participant your contact information, the name of the experiment, the PPN and their PIC, they will be able to prove that they participated in your experiment and you can identify the data that they supplied. Especially if your PPN has a fixed length you can give them a concatenation of PPN and PIC. If for instance the PPN is 1234 and the PIC is A3D4 then you simple send them the following text: |