accumulation_level: Correlation between a chronology and climate data at...
In konradmayer/trlboku: Tree Ring Lab BOKU - a lab internal R function collection

Description Usage Arguments Value Methods (by generic) Examples

The climate data is accumulated (eg. summed or averaged) over varying window sizes (from 1 to window size set with "accumulation") and correlations with a given chronology are calculated ("spearman" by default, but can be set).

accumulation_level(
  crn,
  climate.data,
  accumulation,
  accumfun = sum,
  months = c(-2:10),
  method = "spearman"
)

## S3 method for class 'accumulation_level'
plot(accumulation_level_object, main = "accumulation level")

`crn`	A chronology - the first column is used by the function, make sure to give the right input (in case multiple chronologies are in one object, e.g. as for AR-chronologies).
`climate.data`	climate data in "wide format" with years in the first column and monthly climate measurement in the consecutive 12 columns.
`accumulation`	an integer specifying up to which window size accumulations get calculated.
`accumfun`	function to use for accumulation of the climate measure within the window.
`months`	an integer sequence selecting the end months of the windows to use. 1:5 selects jan to may of the "current" years as end months. to select months of the "previous" years use negative integers - c(-2:10) selects last years October to current years October as end months. Selection needs to be within c(-11:12).
`method`	method to calculate correlations - "pearson", "kendall" or "spearman".
`accumulation_level_object`	an object obtained by accumulation_level.
`main`	a plot title