[GH-169] Add Psychological Line (PSL) Support #170
Merged
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The Psychological Line indicator is the ratio of the number of rising periods over the total number of periods.
https://library.tradingtechnologies.com/trade/chrt-ti-psychological-line.html
Formular:
Example:
df['psl']
retrieves the PSL with default window 12.df['psl_10']
retrieves the PSL with window 10.df['high_12_psl']
retrieves the PSL of high price with window 10.