

   AA  ttiimmee sseerriieess oobbttaaiinneedd bbyy ssaammpplliinngg tthhee ffiirrsstt vvaarriiaabbllee ((XX))
   ooff tthhee RRoosssslleerr ssyysstteemm.. SSeeee tthhee hheellpp ffiillee rroosssslleerr..ssttaattee ffoorr
   ddeettaaiillss ooff tthhee ssyysstteemm..

