FIS points are typically the average of the best 5 results over the prior calendar year. This is a fast, Rcpp way to replicate this calculation.
1 2 | lag_best_avg(x, dates, n = 5L, window = 365L, adj = c(1.4, 1.3, 1.2, 1.1,
1))
|
x |
numeric vector of values |
dates |
dates, assumed to be character in YYYY-MM-DD format |
n |
integer |
window |
integer; previous number of days to examine |
adj |
vector of adjustments for when there are fewer than |
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