E.g., in, say, the OECD countries, the Ph.D. degree
holders who got their Ph.D. in year 2000 make up
about 1% of the population, and the Ph.D. degree
holders who got their Ph.D. in year 2011 make up
about 2% of the population?
It's a bit tough to read the vertical axis labels
on the right. If save the graph as a file to
disk, unfortunately a JPG, good for landscapes,
instead of a lossless file type such as GIF or PNG,
and magnify the image, then can read the labels
on the right axis. Alas, find that the labels
are 0, 1, 1, 2, 2, 3, 3, 4, 4. I have team
of researchers working on what those axis labels
mean and will post here again when they submit
their solution!
I think (i.e. infer from context) that they mean that in 2000, the people who were of an age to be getting PhDs[0] made up that percent of their age "group"[1]. On the axes, I'm assuming due to poor choice of sig figs that "0, 1, 1, 2, 2" represents "0, 0.5, 1, 1.5, 2, ...", because that seems plausible.
But yes, that figure (all the figures in the article, really) could have used a bit of editorial guidance.
[0] vague!
[1] other people "of an age to be getting PhDs"? also vague!
What "corresponding age cohort?
E.g., in, say, the OECD countries, the Ph.D. degree holders who got their Ph.D. in year 2000 make up about 1% of the population, and the Ph.D. degree holders who got their Ph.D. in year 2011 make up about 2% of the population?
It's a bit tough to read the vertical axis labels on the right. If save the graph as a file to disk, unfortunately a JPG, good for landscapes, instead of a lossless file type such as GIF or PNG, and magnify the image, then can read the labels on the right axis. Alas, find that the labels are 0, 1, 1, 2, 2, 3, 3, 4, 4. I have team of researchers working on what those axis labels mean and will post here again when they submit their solution!