To learn how to analyse questions, you can follow the steps below.
 Click the domain School name in the menu on the left.
 Click on label_importantCourses in the menu at the top.
 Click on your course or use the search bar.
 Click on your assignment or use the search bar.
 Click analytics Insights in the menu at the top.
 Click Questions in the menu on the left.
Here, you will find Analysis on your questions.
On this page, each question is analysed individually. There are five elements pertaining information on the questions:
p, p', Rit, Rir, and Rk
All of these values are calculated for multiple choice questions, while the p, Rit, and Rirvalues are calculated for open questions. Please note, the Rit and Rir value cannot be calculated when using flow.
The meaning of these values are as follows:

p: Rate of difficulty
The pvalue is the percentage of students that correctly answered the question. The higher the value, the easier the question.
p = [number of students that answered this question correctly] / [total number of students]

p': Rate of difficulty corrected for the guess correction
The p'value is the percentage of students that know the question. This value ranges between a minimum of 0,25 and a maximum of 0,9. If the value equals 0,5, then it can be said that a maximum discrimination between strong and weak students is found.
p' = p  [ (1p) / (number of options for this multiple choice question  1) ]

Rit: Relation of the question to all questions in the test
The Ritvalue indicates how well the question fits the test; the higher, the better.
A value greater than 0,40 is very good.
A value between 0,300,39 is good, but the question still has room for some improvement.
A value between 0,200,29 is a doubt.
Any value lower than 0,19 indicates that reconstruction of the question should be considered.
The equation for how Rit calculation is as follows:
Yg = average total score of students that answered correctly
Yf = average total score of students that answered incorrectly
Sy = standard deviation of the total score
Sy = standard deviation
q = (1p)

Rir: Relation of the question to all other questions (so all questions except this one)
This value measures the same as the Ritvalue, but the Rirvalue is more exact, while it is not compared to itself.
A value higher than 0,40 is very good.
A value between 0,300,39 is good, but the question still has room for some improvement.
A value between 0,200,29 is a doubt.
Any value lower than 0,19 indicates that reconstruction of the question should be considered.
The equation is given below.

Rk: Corrected guess effect
In a question with, for example, 4 choices and 1 correct answer, there's a 1 in 4–or 25%–chance the answer can be guessed correctly. If the question is worth, for example, 1 full point, then the student is awarded a score of 0,25 points for guessing correctly. This does not inherently accurately reflect the student's grasp on the knowledge required.
Rk is the corrected guess effect, where, within the score calculation, the choices from others are taken into consideration in order to judge such information more accurately.
For every question, based on the p, p', Rit, Rir and Rkvalues, one of the following conclusions is made:
 Good: All values are within the appropriate ranges.
 Easy: The p and p'values are probably too high.
 Difficult: The p and p'values are probably too low.
 Needs attention: The Rit and/or Rirvalues can be too low (< 0.30). The question is not representative for the assignment.
Aside from these elements that provide insight to the questions, there is also an option for the contribution status for each question. This option is in the form of a dropdown menu.
In the menu, four options are shown:
 Contributes: This is the standard option; the question contributes to the grades of the students.
 Bonus: The question will not be taken into account in the maximum score that can be gained, but it can be a bonus for the students answer correctly.
 Full points: Every student is awarded the maximum amount of points possible for this question.
 Disabled: The question and the points awarded for the question will be taken out of the exam and will not be taken into account for the grading.
If you select another contributiontype in the dropdown menu, the consequences of this edit will be displayed. You can check the consequences and click Confirm to edit the contribution.
error_outline In a "randomly generated exam" not all students will get the same exercises. The Rit and Rir values indicate a correlation between the exercises and the final result of a test. Because not everyone is given the same exercises, this correlation cannot be calculated.
Comments
1 comment
Hi Mike, I am looking to find some more information on the Rk value. Online I find something about Remember (R) vs Know (K). Is that what is meant here? How is the value determined in ANS? If you get the chance, please inform me of the answer through my work email address l.juurlink@chem.leidenuniv.nl
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