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Hi:
The ROC is not listed in the Indicator Builder list, but if you go to the Help files and search on "rate of change" it will list one topic with that name. Under that topic it lists:
Rate of Change
SYNTAX roc( DATA ARRAY, PERIODS, DIFF_METHOD )
FUNCTION Calculates the PERIODS rate-of-change of DATA ARRAY expressed as DIFF_METHOD.
Valid DIFF_METHODs are PERCENT and POINTS (these can be abbreviated as % and $).
EXAMPLE The formula "roc( CLOSE, 12, PERCENT )" returns the 12-period percent rate-of-change of the closing prices.
Don't know why, but there are other indicators that aren't listed in their regular list that can be found by going to the Help system.
Jay
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