Arguments
- data
Data frame or grouped data frame.
- by
Desired interval of time expressed as numeral plus one of "secs", "mins", "hours", "days", "weeks", "months", or "years". If a numeric is provided, the value is assumed to be in seconds.
- trim
Number of observations to trim off the front and end of each time series
- tz
Time zone to be used, defaults to "UTC" (Twitter default)