A slope graph is a line chart that compares each series at two endpoints, connecting its first and last values. By removing intervening years, it directs attention to the change between chosen dates rather than the full trend. section 2.3.1
Use it when the audience needs a direct before-and-after comparison. Choose the measure carefully: tourist-arrival counts answer a different question from percentage increase, even when both use the same dates. section 2.3.1
Tourist arrivals, 1994 to 2018
Filter the data to 1994 and 2018, then draw one line per country with tourist arrivals on the y-axis. This contrasts with a stacked bar chart exercise built from the same slope-chart result. section 2.3.1
Figure 2.11 The output of exercise 1
The example output shows the requested two-endpoint slope graph for the tourist-arrivals comparison. section 2.3.1
