Figure 7: The graph shows the share of geo-referenced patents (coverage) for each period and the associated P-values. | Scientific Data

Figure 7: The graph shows the share of geo-referenced patents (coverage) for each period and the associated P-values.

From: Unveiling the geography of historical patents in the United States from 1836 to 1975

Figure 7

Red coloured dots represent the P-values of the statistical chi-squared test for each period, while the blue line shows the coverage of the sample over that period. As before, coverage is calculated as the proportion of patents with at least one location in the final database.

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