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I am trying to filter transients out of a numerical dataset depicting a ship’s operation. Keying off of a SPEED attribute, I used a DIFFERENTIATE operator to determine the change between SPEED(t) and SPEED(t-1) sequential records in the dataset. DIFFERENTIATE created an attribute with the name change(SPEED) with the SPEED difference between adjacent rows. Now I want to filter out records above a threshold, but the attribute name “change(SPEED)” triggers an error. Any suggestions on how I can filter this attribute created by DIFFERENTIATE?