smoothSeries: smoothSeries
In SOLV-Code/MetricsTest: Functions for WSP Metrics

function to calculate a smoothed version of an input vector (calculate the running geometric mean of log_e transformed data)

smoothSeries(
  vec.in,
  gen,
  filter.sides = 2,
  log.transform = TRUE,
  out.exp = TRUE,
  na.rm = FALSE
)

`vec.in`	vector with numeric values
`gen`	generation time (i.e. number of years to average)
`filter.sides`	time window for gen avg (1 = past values only, 2= centered)
`out.exp`	if TRUE, then convert the output back from log space)
`na.rm`	if FALSE, then any gen avg including NA values will be NA
`convergence.check`	if TRUE, do an automated convergence check