The function plots the cumulative distribution of the values of the covariate at the locations of
the input point pattern, and adds an acceptance interval (with significance level equal to 0.05;
sensu Baddeley et al., "Spatial Point Patterns. Methodology and Applications with R", CRC Press
2016, 208) that allows to assess the statistical significance of the observed cumulative
distribution. The interval is built by calculating the cumulative distribution of B realizations
of a Complete Spatial Random process, and keeping the middle 95percent of those B distributions.
B is set by default to 200, but can be increased by the user. The number of random points drawn
during each of the B simulations is equal to the number of features of the input point
pattern.
For an example of the cumulative distribution plot plus acceptance interval, see for
instance Carrero-Pazos, M. (2018). Density, intensity and clustering patterns in the spatial
distribution of Galician megaliths (NW Iberian Peninsula). Archaeological and Anthropological
Sciences. https://doi.org/10.1007/s12520-018-0662-2, figs. 4 and 5.