This function removes the nonhost growth signal from a host tree-ring series.
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
applied to the common period.
gsi() will rarely be run directly by a user. It is called from
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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