PI enables a pull of up to 100K observations per call. If needed to
pull more than the API limit per call, recommend to iterate the call with
the use of the start, end and/or offset arguments</p></dd>
<dt>offset</dt>
<dd><p>An integer, optional, set the number of observations to offset
from the default starting point of the series. If set to NULL (default), will default
to the API default value of 0</p></dd>
<dt>frequency</dt>
<dd><p>A string, optional, define the API frequency argument
(e.g., hourly, month