The Full Stochastic is a generalization of the Fast Stochastic and the Slow Stochastic and uses three parameters:
As in the Fast and Slow Stochastics, the first parameter is the number of periods used to create the initial %K line and %D is again the number of periods used to create the signal line.
What makes the Full Stochastic unique is its use of a "smoothing factor" for the initial %K line. The %K (full) line plotted is a n-period SMA of the initial %K line (where n is equal to the middle parameter).
The Full Stochastic Oscillator is more advanced and more flexible than the Fast and Slow Stochastic and can even be used to generate them. For example, a (14, 1, 3) Full Stochastic is equivalent to a (14, 3) Fast Stochastic while a (12, 3, 2) Full Stochastic is identical to a (12, 2) Slow Stochastic.
Look for readings below 20 as an oversold signal while readings above 80 act as an overbought signal. However, securities can continue to rise after the Stochastic Oscillator has reached 80 and can continue to fall after it has reached 20. It may be better to wait for the oscillator to move from overbought territory back below 80 or from oversold territory to back above 20 before trading.