In the previous step, you learnt how to view the insights of the objectives used in your digital test. In this step, you will learn how to view the insights of the rank correlation. Analysing the rank correlation of the exercises can help determine if your question correlates well to the whole test.
To gain insights into the rank correlation of the exercises in your digital test, click on analytics Insights from within your digital test. You will then be brought to the Insight overview page. Click Rank correlation in the box on the left.
How we determine the rank correlation
For the rank correlation we sort students by their final grade and divide them in 5 groups. We then show the average score of each group for that specific question.
If the line in the graph is roughly horizontal, it means that the question was answered just as well by the overall higher scoring students as by the overall lower scoring students.
If the line is more ascending, it means that the overall higher scoring students answered this question better than the overall lower scoring students, as you would expect for most questions.
Normalised average score
The normalised average score for each student is divided by maximum score/number of points for the question.
For the quintile groups, the students are ordered by their final grade and divided into 5 groups. You will see the average score for each group for this specific question.