TA is Technical Analysis (as opposed to FA, Fundamental Analysis)
Technical Analysis includes Stochastics RSI, etc. W%r is Williams %r. It is just another on a long list of technical indicators that attempt to define overbought/oversold condition. They are all pretty much based on moving averages of various highs, lows, over an assortment of time frames.
I have the formula around somewhere, but can't locate it at the moment.
Here is a link to a great PDF document that pretty much covers everything in TA (122 pages).
From the pdf doc on W%r... An interesting phenomena of the %R indicator is its uncanny ability to anticipate a reversal in the underlying security's price. The indicator almost always forms a peak and turns down a few days before the security's price peaks and turns down. Likewise, %R usually creates a trough and turns up a few days before the security's price turns up.
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