Convert endemicity to SSE states
Arguments
- endemicity_status
character vector with values "endemic", "nonendemic" and/or "not_present"
- sse_model
either "musse" (default) or "geosse". MuSSE expects state values 1, 2, 3, which here we encode as "not_present", "endemic", "nonendemic", respectively. GeoSSE expects trait values 0, 1, 2, with 0 the widespread state (here, "nonendemic"), and 1 and 2 are "not_present" and "endemic", respectively.