Panel.first(offset) Convenience method for subsetting initial periods of time series data based on a date offset.
| Parameters: | offset : string, DateOffset, dateutil.relativedelta |
|---|---|
| Returns: | subset : type of caller |
ts.first(‘10D’) -> First 10 days
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http://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.Panel.first.html