<div dir="ltr"><div dir="ltr">Dear Fieldtrip community, <div><br></div><div>I am ultimately hoping to perform the cluster-based permutation testing for comparing potential power differences between two groups.</div><div><br></div><div>From my understanding, to facilitate statistical comparisons, baseline normalization is warranted.</div><div><br></div><div>Would it be appropriate (if at all) to do this baseline normalization right after following ft_freqanalysis?</div><div><br></div><div>My current frequency preprocessing looks like this for a single subject: </div><div>
<p class="gmail-p3" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier;min-height:12px"><span class="gmail-Apple-converted-space"> </span></p>
<p class="gmail-p2" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier;color:rgb(37,153,45)"><span class="gmail-s2" style="color:rgb(0,0,0)"><span class="gmail-Apple-converted-space"> </span></span>% frequency analysis</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier"><span class="gmail-Apple-converted-space"> </span>cfg <span class="gmail-Apple-converted-space"> </span>= [];<span class="gmail-Apple-converted-space"> </span></p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier"><span class="gmail-Apple-converted-space"> </span>cfg.output<span class="gmail-Apple-converted-space"> </span>= <span class="gmail-s1" style="color:rgb(178,69,243)">'powandcsd'</span>;</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier"><span class="gmail-Apple-converted-space"> </span>cfg.method<span class="gmail-Apple-converted-space"> </span>= <span class="gmail-s1" style="color:rgb(178,69,243)">'mtmconvol'</span>;</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier"><span class="gmail-Apple-converted-space"> </span>cfg.foi <span class="gmail-Apple-converted-space"> </span>= 2:1:40;</p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier"><span class="gmail-Apple-converted-space"> </span>cfg.t_ftimwin <span class="gmail-Apple-converted-space"> </span>=<span class="gmail-Apple-converted-space"> 2</span> ./ cfg.foi; </p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier"><span class="gmail-Apple-converted-space"> </span>cfg.tapsmofrq <span class="gmail-Apple-converted-space"> </span>= 0.4 *cfg.foi;<span class="gmail-s3" style="color:rgb(37,153,45)"> </span></p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier"><span class="gmail-Apple-converted-space"> </span>cfg.toi <span class="gmail-Apple-converted-space"> </span>= -0.4:0.01:0.4;</p>
<p class="gmail-p3" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier;min-height:12px"><span class="gmail-Apple-converted-space"> </span></p>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier"><span class="gmail-Apple-converted-space"> </span>dataSPfreq = ft_freqanalysis(cfg, dataSPfreq);<span class="gmail-Apple-converted-space"> </span></p><div><br></div><div>
<p class="gmail-p1" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier;color:rgb(37,153,45)"><span class="gmail-s1" style="color:rgb(0,0,0)"><span class="gmail-Apple-converted-space"> </span></span>%baseline correction</p>
<p class="gmail-p2" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier"><span class="gmail-Apple-converted-space"> </span>cfg = [];<span class="gmail-Apple-converted-space"> </span></p>
<p class="gmail-p2" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier"><span class="gmail-Apple-converted-space"> </span>cfg.baseline = [-0.4 -0.1];<span class="gmail-Apple-converted-space"> </span></p>
<p class="gmail-p2" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier"><span class="gmail-Apple-converted-space"> </span>cfg.baselinetype = <span class="gmail-s2" style="color:rgb(178,69,243)">'db'</span>;<span class="gmail-Apple-converted-space"> </span></p>
<p class="gmail-p2" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier"><span class="gmail-Apple-converted-space"> </span>dataSPfreq = ft_freqbaseline(cfg, dataSPfreq);<span class="gmail-Apple-converted-space"> </span></p><p class="gmail-p2" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier"><span class="gmail-Apple-converted-space"><br></span></p><p class="gmail-p2" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier"><span class="gmail-Apple-converted-space"><span style="font-family:Arial,Helvetica,sans-serif;font-size:small">From here, I then was hoping to submit my two structures, each containing the single subject preprocessed data from their respective group, to freq_statistics.</span><br></span></p><p class="gmail-p2" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier"><span class="gmail-Apple-converted-space"><span style="font-family:Arial,Helvetica,sans-serif;font-size:small"><br></span></span></p><p class="gmail-p2" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;line-height:normal"><font size="2">I initially thought this was fine, but when trying to use ft_singleplotTFR, I ran into this error: </font><font color="#ff0000" style="font-size:small">Complex values are not supported, </font><font color="#000000" style=""><font size="2">which only occurred when I did the baseline correction (I also ran it without any baseline correction and it worked fine).</font></font></p><p class="gmail-p2" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;line-height:normal"><font color="#000000" style=""><font size="2"><br></font></font></p><p class="gmail-p2" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;line-height:normal"><font color="#000000" style=""><font size="2">Any insight would be greatly appreciated.</font></font></p><p class="gmail-p2" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;line-height:normal"><font color="#000000" style=""><font size="2"><br></font></font></p><p class="gmail-p2" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;line-height:normal"><font color="#000000" style=""><font size="2">Thank you,</font></font></p><p class="gmail-p2" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;line-height:normal"><font color="#000000" style=""><font size="2">Paul</font></font></p><p class="gmail-p2" style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:10px;line-height:normal;font-family:Courier"><br></p></div><div><br></div></div></div></div>