Fig. 1
From: How do citizens feel about their water services in the water sector? Evidence from the UK
Overall satisfaction with water and value for money of water (data source from CCW [43]). The rolling 9-year averages are calculated based on the total valid base of weighted data at each time point. The 9-year trends are assessed using the Mann–Kendall method [119, 120]. The Mann–Kendall analysis is applied to exponentially smooth, transformed data rather than the raw data. The data calculation methods in Figs. 2, 3, and 4 also use this method