The following reasons can contribute to low usable rate for webcam experiments:
- Experiment design. An average usable rate decreases when survey questions are added before or in between media. Start the experiment with instructions, followed by your media, and save all your survey questions for the end of the experiment to ensure the participant is more focused and maintains proper posture throughout the eye tracking part of the trial.
- Duration time. The longer the time, the higher the probability that users move their heads, invalidating the session. Try to keep the duration of the eye tracking part within 300 seconds.
- Calibration Check Points. Turning additional CCPs off may lower the study's usable rate. It is recommended that you keep all CCPs enabled to maintain the accuracy of the data collected.
- Participants behaviour. When a respondent enters a Sticky experiment, they are informed how to behave throughout the session to ensure they provide us with usable data. The better a panelist follows the guidelines the more likely their session will be usable.
- Gaze data quality. If for any technical reasons it is not possible to get good quality data, the session will be marked as unusable so that inaccurate data will not affect the results.
Optimizing your usable rate helps lower your cost as well as lower the time your experiment is in fielding.
Peculiarities of webcam experiments