For example if two data groups are selected, date will be first data group's date, if selected series are belong to the first data group, or date will be second data group's date if selected series are belong to the second data group, or date will be the union of two data groups' date if series are selected from two data groups. The Beginning and the ending dates of the chosen time series are displayed in these fields which are formatted in accordance to the chosen frequency. A different date period may be chosen by making an appropriate change to the format displayed. First and last date are displayed in parenthesis. This field applies the functions below to the selected series and result is passed the other process like graph and table.
Users can select more than one formula at the same time.
System issues a warning message and returns the value NC for each element of the returned series that has the zero or negative value in its calculation. System issues a warning message and returns the value NC for each element of the returned series that has the zero or negative value in its calculation. There are two options. At first, user can draw up to four time series on the same graphic at the same scale. If more than four time series were selected, the system draws from first to fourth series.