[R] Interpret List Label as Date from Quantmod getOptionChain

[Sparks, John]

Package?  Quantmod.  In the subject line.


I agree that they look like dates, I don't know how to determine if they are actually dates.


Josh Ulrich usually answers questions along these lines very informatively and quickly.   One reasonable course of action is to wait to see if he does the same with this one.


--JJS


________________________________
From: Bert Gunter <bgunter.4567 at gmail.com>
Sent: Sunday, March 4, 2018 8:38 PM
To: Sparks, John
Cc: r-help at r-project.org
Subject: Re: [R] Interpret List Label as Date from Quantmod getOptionChain

Package?

The **names** of the top levels of your lists, "Mar.09.2018", "Mar.23.2018" certainly look like dates and if they are -- I have no idea what package/context is -- they certainly could be formatted as such. See e.g. "date-time" . There are also several package that provide date tools.

Cheers,
Bert


Bert Gunter

"The trouble with having an open mind is that people keep coming along and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )

On Sun, Mar 4, 2018 at 6:28 PM, Sparks, John <jspark4 at uic.edu<mailto:jspark4 at uic.edu>> wrote:
Hi R Helpers,


Is it possible to interpret the top level of the list as a date after downloading all the option chain data for a ticker?


For example, after I run


aapl_total<-getOptionChain("AAPL", NULL)


the top descriptor of the lists is a date (Mar.09.2018, Mar.23.2018, etc.).


So if want to subset down to those parts of the list that correspond to say, (expiration) year=2019; or say, Mar or Apr or May of 2019, is this possible?


Guidance would be appreciated.

Thanks.


--John J. Sparks, Ph.D.




str(aapl_total)

List of 16
 $ Mar.09.2018:List of 2
  ..$ calls:'data.frame':       31 obs. of  7 variables:
  .. ..$ Strike: num [1:31] 135 143 146 147 148 ...
  .. ..$ Last  : num [1:31] 42.4 36.2 32 28.4 31 ...
  .. ..$ Chg   : num [1:31] 0 0 12.6 -4.71 0 ...
  .. ..$ Bid   : num [1:31] 41 35.8 32.8 29.1 28.1 ...
  .. ..$ Ask   : num [1:31] 41.5 36.4 33.4 29.5 28.6 ...
  .. ..$ Vol   : int [1:31] 5 2 1 45 2 2 90 3 11 129 ...
  .. ..$ OI    : int [1:31] 17 0 117 58 3 22 171 84 707 238 ...
  ..$ puts :'data.frame':       37 obs. of  7 variables:
  .. ..$ Strike: num [1:37] 130 135 138 139 140 141 142 143 144 145 ...
  .. ..$ Last  : num [1:37] 0.01 0.07 0.27 0.04 0.03 0.98 0.05 0.03 0.03 0.01 ...
  .. ..$ Chg   : num [1:37] 0 -0.12 0 0 0 0 -0.05 0 0 -0.01 ...
  .. ..$ Bid   : num [1:37] 0 0.01 0 0 0 0.05 0.06 0 0 0 ...
  .. ..$ Ask   : num [1:37] 0.04 0.07 0.02 0.03 0.02 0.13 0.13 0.03 0.03 0.02 ...
  .. ..$ Vol   : int [1:37] 2 11 1 10 5 0 1 150 1 127 ...
  .. ..$ OI    : int [1:37] 8 12 1 0 723 192 37 275 125 297 ...
 $ Mar.23.2018:List of 2
  ..$ calls:'data.frame':       35 obs. of  7 variables:



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