How is Delta Day, Week, Month Calculated?

Delta is Change in GLV as a percent.   GLV is Unrealised + Cash.     ( ( glv now – glv ( Yesterday | Friday | Last Month )  )  /  glv ( Yesterday | Friday | Last Month )  ) ) * 100   If it shows n/a, that generally means there was not a value for the beginning of the period.. Eg.  if looking at Delta Week and the position was opened after previous Friday..