Description Usage Arguments Details Value

This function removes the nonhost growth signal from a host tree-ring series.

1 | ```
gsi(input_series)
``` |

`input_series` |
A |

The growth suppression index (GSI) is referred to as the "corrected" series in OUTBREAK. It is calculated as:

*GSI(i) = H(i) - (NH(i) - mean(NH)) sd(H)/sd(NH)*

where H and NH are the host and nonhost tree-ring series as standardized
index values; i is the year, and the functions `mean()`

and `sd()`

are
applied to the common period.

`gsi()`

will rarely be run directly by a user. It is called from
`defoliate_trees()`

.

A data frame with the two input columns (host and nonhost series) and 3 added columns:

The mean/sd adjusted non-host chronology,

The growth suppression index ("gsi") of the host series after subtraction of the adjusted nonhost chronology,

The normalized growth suppression index ("ngsi") generated by applying

`scale()`

to the gsi.

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