Apple Inc (AAPL)

[TREND1]

Good Question.
After reading Stock Charts Chart School I found
that SLOW STO(14,1) is George Lane's original Sto
presented in the late 1950's.
see
There are three versions of the Stochastic Oscillator available on SharpCharts.

The Fast Stochastic Oscillator is based on George Lane's original formulas for %K and %D. %K in the fast version that appears rather choppy. %D is the 3-day SMA of %K
In fact, Lane used %D to generate buy or sell signals based on bullish and bearish divergences.
Lane asserts that a %D divergence is the "only signal which will cause you to buy or sell".

Because %D in the Fast Stochastic Oscillator is used for signals, the Slow Stochastic Oscillator was introduced to reflect this emphasis.
The Slow Stochastic Oscillator smooths %K with a 3-day SMA, which is exactly what %D is in the Fast Stochastic Oscillator. Notice that %K in the Slow Stochastic Oscillator equals %D in the Fast Stochastic Oscillator

http://stockcharts.com/school/doku.php?st=full+sto&id=chart_school:technical_indicators:stochastic_oscillato