Relative Strength Index. Wilder's smoothing by default; Cutler's via method='cutler'.
Period. Wilder's original choice is 14.
Smoothing convention. 'wilder' matches TA-Lib and pandas-ta; 'cutler' uses a plain SMA.
Warmup behaviour.
https://screamer.readthedocs.io/en/latest/ for the Python reference and full details.
Relative Strength Index. Wilder's smoothing by default; Cutler's via method='cutler'.