StockFetcher Forums · General Discussion · actual rsi(2) equation<< >>Post Follow-up
198 posts
msg #66066
Ignore tomm1111
8/11/2008 1:36:04 PM

Anybody know the actual rsi(2) equation SF uses? Using only 2 bars returns alot of 0's and 100's, however, that is not what a SF rsi(2) filter returns.

The following rsi equation doesn't work.

RSI = 100 - 100 / (1 + RS)
RS = AG / AL

198 posts
msg #66094
Ignore tomm1111
8/11/2008 8:33:06 PM


Smart guys, SF. What's the actual RSI(2) equation used?

267 posts
msg #66097
Ignore tomb
8/11/2008 9:42:20 PM


The RSI is a cumulative measure where the current value is based on all previous values. On StockFetcher, a measure such as this is "seeded" with at least 2 years of historical values to compute the most recent value. In other words, an RSI(2) is not just based on the last 2 periods (as a simple moving average would be.)

As you noted, Wilder's RSI formula is:

RSI = 100 - (100 / (1 + (AG/AL)))

However, note that the 'AG' and 'AL' components are not derived from simple moving averages, but each are computed using Wilder's smoothing method:

X(i) = [X(i-1)(n-1) + Y(i)] / n

Where X(i) is your current average, and Y is your input data series. The above is very similar to an EMA, and as you can see requires all previous values to compute the current value.

Tom Support

198 posts
msg #66099
Ignore tomm1111
8/11/2008 10:52:31 PM

Cool. Thanks Tomb for the reply.

I think I remember running into that equation at some point. I'm going to look into it further.


StockFetcher Forums · General Discussion · actual rsi(2) equation<< >>Post Follow-up

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