One or more expiration dates, or NULL.
If Exp is missing, the default is to
only return the front month contract.
src
Source of data. Currently only yahoo is provided
...
additional parameters
Value
A named list containing two data.frames, one
for calls and one for puts. If more than one
expiration was requested, this two-element list
will be contained within list of length length(Exp).
Each element of this list will be named with the expiration
month and year (for Yahoo sourced data).
If Exp is set to NULL, all expirations
will be returned. Not explicitly setting will only
return the front month.
Details
This function is a wrapper to data-provider specific
APIs. By default the data is sourced from yahoo.