Hi there,
That methodology's name is RAVI (Range Action Verification Index), you can find it in Mr. Chande's book:
Beyond Technical Analysis: How to Develop and Implement a Winning Trading System.
Here's the original formula:
RAVI = Absolute value (100 x (7-SMA-65-SMA)/65-SMA)
And here's the formula implemented to MetaStock:
RAVI: Abs(100*(Mov(C,7,S)-Mov(C,65,S))/Mov(C,65,S));
And here's the picture:
Interpretation: If the RAVI fall down under three (3.0) you may call it ranging, but if RAVI raise over three (3.0) it can be called trending.
But I prefer to modified that MetaStock formula with mine, so the interpretation will be more simple like this:
If the RAVI fall down under zero (0) it is ranging, but if RAVI raise over zero (0) it can be called trending.
Here's the formula on MetaStock:
RAVI: Abs(100*(Mov(C,7,S)-Mov(C,65,S))/Mov(C,65,S))-3;
And here's the lovely picture:
Goodluck,
Pall Mall