<div dir="ltr"><div dir="ltr"><div>White Noise represents the same variance at all frequencies. The spectrum is flat.</div><div>----<br></div><div>  sdof = <b>specx_anal(</b>x,d,sm,pct)<br>  print(sdof)<br>  nspc = dimsizes(sdof@spcx)<br>;************************************************<br>; calculate average spectrum value<br>;************************************************<br>  white  = <b>sum</b>(sdof@spcx)/nspc     ; average; same power at all frequencies   ; scalar</div><div>;************************************************<br></div><div>; upper and  lower confidence bounds</div><div>; *** I can not remember if <b>cdfchi_x i</b>s the correct function<b>  ***<br></b></div><div>;************************************************</div><div>  w025  = white*<b>cdfchi_x</b> (0.025,sdof)/sdof                      ; scalar<br>  w975  = white*<b>cdfchi_x </b>(0.975,sdof)/sdof                      ; scalar<br>  print(nspc+"  "+ssum+"  "+w025+"  "+white+"  "+w975)</div><div><br></div><div>WHITE = <b>conform</b>(sdof@spcx, white, 0)      ; WHITE[*] ==> WHITE(nspc)</div><div>W025   = <b>conform</b>(sdof@spcx, w025, 0)      ; W025[*]</div><div>W975   = <b>conform</b>(sdof@spcx, w975, 0)      ; W975[*]</div></div><div><br></div><div>Good Luck</div><div><br></div><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jul 24, 2020 at 1:51 PM Jing Sun via ncl-talk <<a href="mailto:ncl-talk@mailman.ucar.edu">ncl-talk@mailman.ucar.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="line-height:1.7;color:rgb(0,0,0);font-size:14px;font-family:Arial"><div style="margin:0px">Dear NCL-users,</div><div style="margin:0px">Has anybody ever calculated the significant level of the spectrum estimated from the "white-noise"?</div><div style="margin:0px">The specx_ci only offer the Markov "Red Noise" spectrum significant level. Does anyone have experience on this?</div><div style="margin:0px">Thanks.</div><div style="margin:0px">Best regards,</div><div style="margin:0px">Jing<br></div></div><br><br><span title="neteasefooter"><p> </p></span>_______________________________________________<br>
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