Entry 16 Visualizing Trends in Declaring and Changing a College Major based on the Interaction Matrix
Seokyeol Kim, Youngju Oh, and Jinah Park — Korea Advanced Institute of Science and Technology

The interaction matrix is a good medium to represent the flows of entities from one group to another. In this visualization, we utilize the interaction matrix to illustrate the trends in student transitions between the college majors. To provide diversified views to the data, we prepared three sections which contain different types of information. (Please note that the major subjects are arranged in order of total difference in the number of students at T1 and those at T3.)

The first section shows the scales of inflows and outflows between the majors over time. The simplest metric to describe the changes is the number of students. However, it has a problem that we can hardly aware a change in a major with the small population, even though it is a huge change for that major. Thus we need to consider both of the absolute size of student flows and the relative scale to each major’s original population. In our work, the size of a cell indicates the number of students who changed their majors and the color shows the ratio of changes to the original population.

The second section tells the changes in the ACT Interest-Major Fit Index (IMFIT) resulting from transitions between the majors. Each cell indicates a change in the population of the IMFIT category per major. According to the result, the student population of ‘Good’ category continues to decrease against our expectations.

Lastly, the third section shows the distribution of the ACT Composite Scores for each major. For each cell, a left half of the cell indicates the population at the past time step, and a right half indicates the population at the future. So an observer can recognize the changes in distribution ratios of the scores over time.

Seokyeol Kim, Youngju Oh, and Jinah Park

School of Computing,
Korea Advanced Institute of Science and Technology, 
291 Daehak-ro, Yuseong-gu, Daejeon, Republic of Korea

{sy.kim, pizzing, jinahpark}@kaist.ac.kr