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decay <- function(yvar, d) { | |
# yvar: a binary variable | |
# d: number of periods | |
# returns: the cumulative sum of yvar at each point | |
# where each addition to the count decays away after d periods | |
yvar[is.na(yvar)] <- 0 | |
run <- cumsum(yvar) | |
tvar <- seq_along(yvar) | |
run <- 0 | |
sum <- 0 |
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