unroll: Recover original data series from moving average
In NateByers/IUHhelpers: Convenience functions for IU Health

Recover original data series from moving average

unroll(
  moving_series,
  original_seed,
  window_length,
  align = c("left", "right"),
  window_function = c("mean", "sum")
)

`moving_series`	a vector of moving averages
`original_seed`	a vector of the first or last numbers of the original series–must be `window_length - 1` or longer
`window_length`	integer length of the window
`align`	character specifying whether the index of the original series was left- or right-aligned or centered (default) compared to the rolling window of series
`window_function`	what function was used to roll up the original data