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<p class="MsoNormal">Hello FieldTrip users,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I want to test an interaction effect using cluster-based permutation test.
<o:p></o:p></p>
<p class="MsoNormal">In my study, I have a between-subject conditions (older adults vs. younger adults) and a within-subject conditions(Hit vs. Miss). Therefore, it is 2 x 2 design.<o:p></o:p></p>
<p class="MsoNormal">I’ve tried to follow this tutorial (<a href="http://www.fieldtriptoolbox.org/faq/how_can_i_test_an_interaction_effect_using_cluster-based_permutation_tests/">http://www.fieldtriptoolbox.org/faq/how_can_i_test_an_interaction_effect_using_cluster-based_permutation_tests/</a>),
but it gave an error.<o:p></o:p></p>
<p class="MsoNormal">I think my design matrix might be the problem.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">First, I made two difference data structure like : Older adults (Hit-Miss difference) & Younger adults (Hit-Miss difference).<o:p></o:p></p>
<p class="MsoNormal">And let’s say I have 8 older adults and 12 younger adults. So I made my design matrix as : [1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 ] <o:p></o:p></p>
<p class="MsoNormal">And set the cfg.uvar = 1; cfg.statistic = 'indepsamplesT';<o:p></o:p></p>
<p class="MsoNormal">However, when I ran it, it gave me an error as below:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:red">Error using ft_notification (line 314)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:red">A within-units shuffling requires a at least one unit variable and at least one independent variable<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:red"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:red">Error in ft_error (line 39)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:red"> ft_notification(varargin{:});<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:red"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:red">Error in resampledesign (line 168)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:red"> ft_error('A within-units shuffling requires a at least one unit variable and at least one independent variable');<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:red"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:red">Error in ft_statistics_montecarlo (line 213)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:red">resample = resampledesign(cfg, design);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:red"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:red">Error in ft_freqstatistics (line 194)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:red"> [stat, cfg] = statmethod(cfg, dat, design);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:red"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">In this case, how can I get a result?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Thank you for your help in advance.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Cay<o:p></o:p></span></p>
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