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Study Quality Index

Study quality index is a numerical value that describes the quality of a study's eyetracking data. It has the minimum value of 0 and maximum value of 100. The larger the index value, the better the study quality. The study quality index is based on calculations that indetify poor data in each session (for each stimulus). The more poor data a session contains, the lower the study quality.

Some cases of poor data:

  • if all gaze points in a session (in a stim) have only one label.
  • if there are lots of repeated gaze points in a label group.
  • if, in a session (in a stimulus), the area of all gaze points only takes 5% of the screen.
  • if there are gaze points that create a random straight line.

These cases exist through our eyetracking software as it is quite sensitive to participant's environment and head movement.

A good study is considered to have a study quality index above 50. If there is a case, that a study quality index is less than 50, we suggest our user to redo the study.