The default settings are 5, 3, and 3. Other commonly used settings for Stochastic include 14, 3, 3, and 21, 5, 5. Stochastic is often referred to as Fast Stochastic with a setting of 5, 4, Slow Stochastic with a setting of 14, 3, and Full Stochastic with a setting of 14, 3, 3.
The responsive 5,3,3 setting flips buy and sell cycles frequently, often without the lines reaching overbought or oversold levels. The mid-range 21,7,7 set looks back at a longer period but keeps smoothing at relatively low levels, yielding wider swings that generate fewer buy and sell signals.
The Dinapoli settings should be similar, but the output is different, try a google search for this information, there is a lot out there.
The Dinapoli Preferred Stochastic indicator uses a smoothing method, which is different from the standard stochastic. It was described by Joe DiNapoli. In DiNapoli’s opinion, this indicator can be useful to all traders who aren’t satisfied with the usual stochastic.
If you are attempting to optimise them for a period of time, they will be anything.