<div dir="ltr"><div dir="ltr">Dear Abby,<div><br></div><div><p style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:16px;margin-top:0px;margin-bottom:0px">> I understand how to extract how many channels/samples are kept in the cleaned dataset using EEG.etc.</p><br class="gmail-Apple-interchange-newline"></div><div>Exactly... well, to be really exact, you calculate sum(EEG.etc.clean_data_points)/length(EEG.etc.clean_data_points) to compute the ratio of the rejected data points.</div><div><br></div><div><span style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:16px">> However, I'd like to keep track of how much data had to be interpolated while batch processing. While this information is easily accessible from the command line (ie. </span><span style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:16px">Keeping 82.5% (132 seconds) of the data) - I'm not sure where this data is saved in the data structure?</span></div><div><ol><li>Apply the cleaning mask you have in EEG.etc.clean_data_points to the data that are BEFORE applying ASR. </li><li>Now you have two data sets with the identical length, but one is before and the other is after cleaning. You can perform simple subtraction to obtain the difference waves for visual inspection, performing statistics, etc.</li><li>One convenient measure I recommend you to try is percent variance accounted for (PVAF) which is computed in this way.</li></ol>PVAF = 100-100*mean(var(beforeASR-afterASR))/mean(var(beforeASR)) <br></div><div><br></div><div>Note that the variance should be computed ACROSS CHANNELS (i.e., variance across scalp maps, for each frame!)</div><div>For the reference of this calculation, see <a href="https://www.ncbi.nlm.nih.gov/pubmed/26738014">https://www.ncbi.nlm.nih.gov/pubmed/26738014</a></div><div><br></div><div>I have one paper under review, a collaboration with UCLA Sandra Loo, in which I calculated and reported all of the cleaning parameters and results... but it is not accepted yet.</div><div><br></div><div>Makoto</div><div><br></div><div><br></div><br><div class="gmail_quote"><div dir="ltr">On Wed, Oct 3, 2018 at 4:23 AM Dickinson, Abigail <<a href="mailto:ADickinson@mednet.ucla.edu">ADickinson@mednet.ucla.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">
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<div id="gmail-m_1097795455575698644divtagdefaultwrapper" style="font-size:12pt;color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif" dir="ltr">
<p style="margin-top:0px;margin-bottom:0px">Hi all, </p>
<p style="margin-top:0px;margin-bottom:0px"><br>
</p>
<p style="margin-top:0px;margin-bottom:0px">I'm hoping to use ASR cleaning, but also want to quantify the amount of data that is interpolated for each participant. </p>
<p style="margin-top:0px;margin-bottom:0px"><br>
</p>
<p style="margin-top:0px;margin-bottom:0px">I understand how to extract how many channels/samples are kept in the cleaned dataset using EEG.etc.</p>
<p style="margin-top:0px;margin-bottom:0px"><br>
</p>
<p style="margin-top:0px;margin-bottom:0px">However, I'd like to keep track of how much data had to be interpolated while batch processing. While this information is easily accessible from the command line (ie. <span>Keeping 82.5% (132 seconds) of the data) - I'm
not sure where this data is saved in the data structure?</span></p>
<p style="margin-top:0px;margin-bottom:0px"><span><br>
</span></p>
<p style="margin-top:0px;margin-bottom:0px"><span>Any help would be greatly appreciated!</span></p>
<p style="margin-top:0px;margin-bottom:0px"><span><br>
</span></p>
<p style="margin-top:0px;margin-bottom:0px"><span>Thanks in advance, </span></p>
<p style="margin-top:0px;margin-bottom:0px"><span><br>
</span></p>
<p style="margin-top:0px;margin-bottom:0px"><span>Abby </span></p>
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