library("PMwR")
library("tinytest")
library("zoo", quietly = TRUE, warn.conflicts = FALSE)
t <- paste(rep(2021:2022, each = 12), 1:12)
t <- as.yearmon(t, "%Y %m")
x <- seq_along(t) + 100
expect_equivalent(unclass(returns(x)),
unclass(returns(zoo(x, t), period = "month")))
expect_equivalent(unclass(returns(x)),
unclass(returns(x, t=t, period = "month")))
xxx <- returns(x, t, period = "ann")
returns(cbind(a=zoo(x, t),
b=zoo(x, t)),
period = "ann")
t <- paste(rep(2021:2022, each = 4), 1:4)
t <- as.yearqtr(t, "%Y %q")
x <- seq_along(t) + 100
expect_equivalent(unclass(returns(x)),
unclass(returns(zoo(x, t), period = "quarter")))
xxx <- returns(x, t, period = "ann")
xxx <- returns(cbind(a=zoo(x, t),
b=zoo(x, t)),
period = "ann")
expect_equivalent(unclass(returns(zoo(x, t), period = "ann")),
(x[length(x)]/x[1L])^(4/(length(x)-1)) - 1)
xxx <- returns(x[1:2], t[1:2], period = "ann")
expect_equivalent(unclass(xxx), x[2]/x[1]-1)
xxx <- returns(x[1:2], t[1:2], period = "ann!")
expect_equivalent(unclass(xxx), (x[2]/x[1])^4-1)
xxx <- returns(x, t, period = "ytd")
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