When I convert GFB.US (U.S. federal budget deficit, monthly) to annual it doesn't match government-reported annual figures. Why not?
The annual figures published by the U.S. government are usually based on the federal fiscal year (FY), which runs from October to September. Data Buffet's frequency conversions assume a calendar year (CY).
To control the 12-month period over which you convert, use the CONVERT basket formula. For example:
The "ANNUAL(SEPTEMBER)" argument specifies that the "year" ends in September.