In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.
//@version=2 study("FRAMA Rate of Change",shorttitle="FRAMA RoC",overlay=false) price = input(hl2) len = input(defval=16,minval=1) FC = input(defval=1,minval=1) SC = input(defval=198,minval=1) len1 = len/2 w = log(2/(SC+1)) H1 = highest(high,len1) L1 = lowest(low,len1) N1 = (H1-L1)/len1 H2 = highest(high,len)[len1] L2 = lowest(low,len)[len1] N2 = (H2-L2)/len1 H3 = highest(high,len) L3 = lowest(low,len) N3 = (H3-L3)/len dimen1 = (log(N1+N2)-log(N3))/log(2) dimen = iff(N1>0 and N2>0 and N3>0,dimen1,nz(dimen1)) alpha1 = exp(w*(dimen-1)) oldalpha = alpha1>1?1:(alpha1<0.01?0.01:alpha1) oldN = (2-oldalpha)/oldalpha N = (((SC-FC)*(oldN-1))/(SC-1))+FC alpha_ = 2/(N+1) alpha = alpha_<2/(SC+1)?2/(SC+1):(alpha_>1?1:alpha_) out = (1-alpha)*nz(out) + alpha*price roc_len=input(12,title="RoC Length") roc=((out-out[roc_len])/out[roc_len])*100 plot(roc,color=roc>0?(roc>roc?lime:green):(roc>roc?maroon:red),style=histogram,linewidth=3)