This calculates the average value for a series for each full calendar month within the display period. A calendar month runs from the first working day of the month to the last working day of the month.
CMA#(Expression,Carry Indicator,Display indicator)
Where the optional Carry Indicator can be:
D Default; carry previous value, but not between periods
C Carry previous value
I Ignore
N N/A is displayed when there is a null value in the series
Display Indicator - the default is to display values only for complete periods, however the following optional parameters exist –
P Values calculated for incomplete calendar periods at the start of the display period.
R Values calculated for incomplete calendar periods at the start and end of the display period.
See Average format for details.
CMA#(FTSE100,C)
This calculates the average value of the FTSE 100 index for each full calendar month within the display period. Null values within the month are overwritten with the previous day's value. Values are carried over from previous months.
The N parameter is not currently supported by the web Expression Builder in DFO / Datastream Charting, and the function is only accepted in the AFO Expression Builder if the Carry Indicator and Display Indicator are included within the expression. The parameters are however fully supported when used directly in AFO or DFO requests, and a line will be plotted successfully in Datastream Charting.