The indicator was revised by Dorsey in 1995 (Stocks & V.13:09 (388-391): Refining the ).
I suggest the refined RVI with optional settings. If you disabled Wilder's Smoothing and Refined RVI you will get the original version of RVI (1993, as built-in).
Also, you can choose an algorithm for calculating Standard Deviation.
A list of Paid indicators:
Toss a coin to your witcher: