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January 25, 2016

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I wonder if the data is somewhat normalized, because the range is very small (about 1k $ for each level of education). Assuming it would be something like the first year after school mean income, I think the difference is quite small (about 3k between a Bsc and a PHD).

PS: I used the source, and it now becomes clearer: The horizontal axis is log10(income), so 4.6 is about 40k and 4.8 is about 70k, and the OP plotted the distribution of medians of the samples he took from the original data. This explains it to me, but I think it's a curious treatment of the income variable.

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