Grade Plotter

Grade Plotter

Grade Plotter

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A few years ago I was one of six instructors teaching eight sections of Digital Media Lab (BDC 192), a mandatory course for all students in the Ryerson RTA program. I wanted to know if my grades were in the same range as the other instructors so I wrote a data visualization tool that plots the grades students received for their Photoshop assignment across each section.

Mousing over any of the data points opens a popup window with the full image. This makes it easy to compare multiple submissions that received the same grade, and to contrast assignments that got an ‘A’ from one instructor with assignments that got a ‘B’ from another.

In the diagram above, the pink and yellow sections appear to have similar grading patterns. The orange section appears to have greater variance, and the light blue section appears to have a lower range of grades than the other sections. (I wouldn’t want to be in that guy’s class!)

Note: For privacy reasons, the sample images in the demo site were downloaded from the internet using a Google search for “student Photoshop assignment” and the grading data is for illustrative purposes only.

View It Here!

Please contact me if I haven’t already given you a password.

A scatter plot demonstrating grading patterns of different instructors of the same course.

A scatter plot demonstrating grading patterns of different instructors of the same course.

A histogram showing thumbnails of each of the Photoshop assignments stacked in  columns according to the grade they received. Hovering over the thumbnails opens the assignment in a separate window.

A histogram showing thumbnails of each of the Photoshop assignments stacked in columns according to the grade they received. Hovering over the thumbnails opens the assignment in a separate window.

Hovering over the thumbnails opens a window to see the full assignment.

Hovering over the thumbnails opens a window to see the full assignment.

 

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