pointRes: An R package to analyze pointer years and components of resilience

The R package pointRes helps to analyze event years, pointer years and components of resilience for tree-ring datasets (e.g., tree-ring width or basal area increment) by offering highly flexible calculating and plotting functions. Event and pointer years can be identified using established methods based on (i) normalization in a moving window, and (ii) relative growth change. Besides, the resilience components resistance, recovery, resilience and relative resilience can be examined. The analysis of pointer years and resilience components provides quantitative information on growth responses of trees to extreme events as well as on their ability to retain growth levels prior to disturbance. In the face of climate change, with a projected increase in intensity and frequency of extreme events, such information is highly important. The main focus of pointRes is on dendroecological applications, but the package may be used to analyze patterns in other ecological time series as well.