Open Daily Line Normal Distribution Standard deviations (+1/-1, +2/-2, +3/-3)

Question

How can I plot the daily opening line + add this levels (SDEV) above and below?

Above Daily Opening Line: +0.59%, +1.19%, +1.5%, +2.38%, +3.57%
Daily opening line --------------------------------------------
Below Daily Opening line: -0.59%, -1.19%, -1.5%, -2.38%, -3.57%

`study("D O", "D O", true) 
[do] = security(syminfo.ticker, "D", [open], 
lookahead=barmerge.lookahead_on)
plot(do, title="Open", color=color.yellow, linewidth=2, 
trackprice=true)`    

Answer 1

Use ta.stdev

something like that:

//@version=6
indicator('D O', 'D O', true)
[do_1] = request.security(syminfo.tickerid, 'D', [open], lookahead = barmerge.lookahead_on)
plot(do_1, title = 'Open', color = color.new(color.yellow, 0), linewidth = 2, trackprice = true)


lookbackInput = input(5)

var float doStdev = na
if do_1 != do_1[1]
    doStdev := ta.stdev(do_1, lookbackInput)
    doStdev

plot(do_1 + doStdev * 0.59)
plot(do_1 + doStdev * -0.59)