Tableau row level calculations to compare previous row value and current row value

If current row value is greater than previous row value then calculate:
Current row value - previous row value

= IF INDEX() == 1 THEN
ATTR([Delay Minutes])
ELSEIF ATTR([Delay Minutes]) > LOOKUP(ATTR([Delay Minutes]), -1) THEN
ATTR([Delay Minutes]) - LOOKUP(ATTR([Delay Minutes]), -1)
ELSE 0
END

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