For each participant, on the study result, a data chart is available. This feature is explained in the video below:
This chart changes for different parameters of the fixation filters. But there are some aspects that require further explanation.
Let's take a look at an example:
The screen resolution for this tester was 1920x1023 px, but values on the data chart do not exceed 1600 pixels (the top left corner is the (0,0) point). This means that this participant did not look further from the top left corner than 1600 px (he/she didn't wanted to look there, the image tested was narrower than the width of the screen or, for the poor quality results, the data collected wasn't accurate).
The next important thing is what the axes of the chart represent.
The horizontal axis represents time. You can adjust it to your needs (see the data only for some part of the data collected, i.e. between the 1st and the 5th second of the display time) using the orange slider under the chart.
The vertical axis represents values:
- in pixels for X and Y values,
- in pixels per seconds for the velocity.
Velocity changes when the X or Y values change.
So, as you can see, this isn't the (X,Y) chart, but (X,t), (Y,t) and (V,t), where:
- X - x position of the gaze on the screen,
- Y - y position of the gaze on the screen,
- V - gaze velocity,
- t - time.
For fixations only the time of their duration is represented.
As default, denoised values are shown, but you can also see the raw data (values collected at the time of sampling).