Table 3 Statistical evaluation of the trends observed in the macroscopic evolution of the variables (Fig. 9), using a Regional Kendall test.

From: A fragment-based approach for computing the long-term visual evolution of historical maps

Feature

Time range

Trend

n

pval (α = 0.05)

S

Graphical load

1600–1807

None observed

7

0.06 > 0.05

23

1808–1950

Increasing

28

5·10−8

479

Line width

1600–1834

Decreasing

13

8·10−10

–175

1835–1950

Increasing

22

3·10−9

365

Number of components

1600–1950

Increasing

35

1·10−3

404

  1. The data are distributed in 35 temporal strata, and the test is performed jointly on the median of each scale-based strata (1:200–1:2500, 1:2501–1:10,000, 1:10,001–1:53,500). The test is bilateral, with H0 corresponding to an absence of monotonic trend. Kendall’s S statistic is an indicator of the magnitude of the trend.
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