On-line exam for my R course

Today was the day of the final exam for my R course in Paris Dauphine. In the previous years, the exam was an oral 20 minute interview with pairs of students about a project given to them at the beginning of the Fall semester. Unfortunately, this was taking forever since more than 150 students were registered for this course and it was not enough to discriminate between students who had really worked for that course and those who had bought the solution on the Internet.

So we decided to switch to an exam this year with the novelty that the exam would be on-line for students to test their answers on an R terminal and to cut and paste their answer inside a web form, the forms being saved and stored for the instructor to grade them later. The interface we used was WebCT, because this is the local standard, even though it is poorly adequate for a math or computer science exam, the HTML code being restricted and the forms missing facilities for storing computer code. This was a large scale experiment (with 172 students registered this year) and we had to split the exam into three consecutive sessions to face the shortage of available computers, meaning I had to stay in the computer room for 9 consecutive hours!, but the experiment worked in the sense that everyone got access to the exam form and no one lost his or her entry at the end of the exam. We use three slightly modified exams to avoid too much cheating. (The html version posted here is not the form used by the students.)

Now it remains to be seen whether or not the students got enough time to go over this fairly long questionnaire. From what I saw during the exams, students lost a lot of time checking elementary math questions by drawing plots, as for instance in the Accept-Reject question or even when finding the mode of the gamma distribution. A side question is to detect a possible bias in the grades of the last session, since they have had time to communicate with the students of the first session, even though we tried to collect the exam subjects at the end of the first session.

5 Responses to “On-line exam for my R course”

  1. […] were suspiciously close to other codes… In other words, it looked as if they had cheated. (A long-term issue with my R course, alas!) During the meeting, they admitted either to directly copying on […]

  2. […] when the students would not show up in class but only in the labs. The students take an on-line exam at the end of the course in January with multiple choice questions that must be argumented by […]

  3. […] the putative seminar from going on! Similarly, nobody barred me from handling my (ok, by the way!) R grades back to the administration. But I also think this motion and more generally a lot of actions […]

  4. c’etait tout de meme long Xian…

    • Oui, bien sûr, mais c’est noté sur 36 donc en en faisant la moitié on pouvait avoir 20! En le testant on-line (refaisant les codes R from scratch et remplissant les formulaires sous WebCT), ca m’a pris une heure à tout faire…. Certains étudiants ont fait les 3/4, quand même, et m’ont dit qu’ils ont préféré ca à un projet. (Peut-être parce que c’était plus égalitaire, ici pas moyen de payer un sbire pour avoir la solution!) A lire la suite une fois les “copies” corrigées. Et le “biais” du groupe de 14 heures corrigé, si besoin…

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.