Custom variables

Custom variables can be supplied to each participant via URL parameters in the study link.

Participant group

Participants can be allocated to a specific group by appending the pspg parameter to the study link. Participant groups can be used to segregate your participants for between-subjects designs, screening, branching and merging.

For example, https://www.psychstudio.com/s/987?pspg=1 will allocate the participant to Group 1.

Participant group will appear in the results under the column group_number (Figure 1).

Custom identifier

When supplying the custom_id variable via a URL parameter, a participants results will contain that custom id. This is useful for linking participants to individual result sets or for correlating participants across different systems or platforms.

For example, https://www.psychstudio.com/s/987?custom_id=ert45 will associate the participant with a custom id of ert45.

Custom identifiers will appear in the results under the column custom_id (Figure 1).

Arbitrary data

Participants can also be associated with arbitrary data via URL parameters.

For example: https://www.psychstudio.com/s/987?pspg=1&custom_id=ert45&gender=male&edu=BSc.

These data will appear in the results under the column custom_vars (Figure 1).