Constructor for S3 defol class
new_defol(year, series, gsi, ngsi, defol_status)
| year | An integer vector of measured years for each |
|---|---|
| series | A factor of series names for each |
| gsi | A numeric vector of growth suppression index from |
| ngsi | A numeric vector of normalized gsi from |
| defol_status | A factor vector of defoliation event status |
a tree-level `defol` object