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Fig. 6. The scatter plots show the physics-undergraduate-student density against the population density of 15–24-year-olds for each region, along with the linear-regression lines (in the log-log scale), in (a) 2008, (b) 2013, (c) 2018, and (d) 2023. We indicate all of the 16 administrative regions across the four panels, which are identifiable because each point corresponding to each region shares the same value of the horizontal axis in all of the panels.
New Phys.: Sae Mulli 2024;74:610~620 https://doi.org/10.3938/NPSM.74.610
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