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Although median wages went down in each segment, something else happened as well: the number of jobs increased for higher educated groups and declined for lower. Thus the higher-educated, and therefore higher-earning, group had more weight in the 2013 data. The summary number of +0.9% depends not just on the change within population segments, but on the change in the relative sizes of those segments.
Imagine you’re an economist analyzing US unemployment. Looking at data from 2000 to 2013, you see that overall median weekly wages went up by 0.9%, after adjusting for inflation [2, 4]. A natural question is how different population segments fared. For instance, if you group the data by level of education, you’ll presumably see some groups doing better than 0.9% and some doing worse. Since this has obvious policy implications, you reanalyze the data and produce Table 1. To your surprise, all segments lost ground, even though the trend overall was upward! Is that real
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