length_calc: Help calculate how many periods you need for desired index...
In MjStansfi/GEKS_package: Calculate GEKS Indexes with Various Splice Options

Description Usage Arguments Value Examples

View source: R/helper_functions.R

The FEWS function truncates the results by removing the first window. This function helps you determine the amount of periods required to produced the desired FEWS index output length

1	length_calc(index_start, window_length, verbose = TRUE)

`index_start`	how many periods back do you want the index to start (numeric)
`window_length`	window length used

The numeric representation of how many periods you will need in your input dataset to calculate an index of length 'index_start' with a window length of 'window_length'

#I want to calculate an index from June to June for a monthly index with a window length
#of 27 months

#index_start will be 13 as this is the number of periods for June to June

length_calc(index_start = 13, window_length = 27)

#Total periods required:  39