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Hi Cay,
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<div class="">There’s a small typo in the cfg that you pass to ft_freqstatistics: cfg.uvar should read cfg.ivar.</div>
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<div class="">Best wishes,</div>
<div class="">Jan-Mathijs</div>
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<blockquote type="cite" class="">
<div class="">On 15 Sep 2020, at 06:30, Lee, Kyoung Eun <<a href="mailto:klee773@gatech.edu" class="">klee773@gatech.edu</a>> wrote:</div>
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Hello FieldTrip users,<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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I want to test an interaction effect using cluster-based permutation test.<o:p class=""></o:p></div>
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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 class=""></o:p></div>
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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/" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">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 class=""></o:p></div>
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I think my design matrix might be the problem.<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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First, I made two difference data structure like : Older adults (Hit-Miss difference) & Younger adults (Hit-Miss difference).<o:p class=""></o:p></div>
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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 class=""></o:p></div>
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And set the cfg.uvar = 1; cfg.statistic = 'indepsamplesT';<o:p class=""></o:p></div>
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However, when I ran it, it gave me an error as below:<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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<span style="font-size: 10pt; color: red;" class="">Error using ft_notification (line 314)<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; color: red;" class="">A within-units shuffling requires a at least one unit variable and at least one independent variable<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; color: red;" class=""><o:p class=""> </o:p></span></div>
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<span style="font-size: 10pt; color: red;" class="">Error in ft_error (line 39)<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; color: red;" class=""> ft_notification(varargin{:});<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; color: red;" class=""><o:p class=""> </o:p></span></div>
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<span style="font-size: 10pt; color: red;" class="">Error in resampledesign (line 168)<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; color: red;" class=""> ft_error('A within-units shuffling requires a at least one unit variable and at least one independent variable');<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; color: red;" class=""><o:p class=""> </o:p></span></div>
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<span style="font-size: 10pt; color: red;" class="">Error in ft_statistics_montecarlo (line 213)<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; color: red;" class="">resample = resampledesign(cfg, design);<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; color: red;" class=""><o:p class=""> </o:p></span></div>
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<span style="font-size: 10pt; color: red;" class="">Error in ft_freqstatistics (line 194)<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; color: red;" class=""> [stat, cfg] = statmethod(cfg, dat, design);<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; color: red;" class=""><o:p class=""> </o:p></span></div>
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<span style="" class="">In this case, how can I get a result?<o:p class=""></o:p></span></div>
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<span style="" class="">Thank you for your help in advance.<o:p class=""></o:p></span></div>
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<span style="" class=""><o:p class=""> </o:p></span></div>
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<span style="" class="">Best,<o:p class=""></o:p></span></div>
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<span style="" class="">Cay<o:p class=""></o:p></span></div>
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