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Dear Fieldtrippers,</div>
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We are currently adapting a 2 group by 2 condition cluster-based permutation to be a 3 group by 2 condition cluster-based permutation. Following the documentation, we are subtracting the conditions to test the interaction. Does the code below look like a valid
way to do this? It's running correctly and we don't get errors, but we wanted to make sure, since it differed from the setup of the K-by-L example.</div>
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Example code from the 2x2 documentation :</div>
<pre class="elementToProof" style="margin-top: 0px; margin-bottom: 0px; display: block;"><div class="elementToProof" style="text-align: left; text-indent: 0px; font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; font-size: 12pt; color: rgb(0, 0, 0);"><code style="font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;">cfg = [];
cfg.parameter = 'powspctrm';
cfg.operation = 'subtract';
GAdiff11_12 = ft_math(cfg, GA11, GA12);
GAdiff21_22 = ft_math(cfg, GA21, GA22);</code></div></pre>
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...</div>
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[stat] = ft_freqstatistics(cfg, GAdiff11_12, GAdiff21_22);</div>
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Our adaptation of the example code to be a 3x2 interaction:</div>
<pre class="elementToProof" style="margin-top: 0px; margin-bottom: 0px; display: block;"><div class="elementToProof" style="text-align: left; text-indent: 0px; font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; font-size: 12pt; color: rgb(0, 0, 0);"><code style="font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;">cfg = [];
cfg.parameter = 'powspctrm';
cfg.operation = 'subtract';
GAdiff11_12 = ft_math(cfg, GA11, GA12);
GAdiff21_22 = ft_math(cfg, GA21, GA22);</code></div></pre>
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GAdiff31_32 = ft_math(cfg, GA31, GA32);</div>
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...</div>
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[stat] = ft_freqstatistics(cfg, GAdiff11_12, GAdiff21_22, GAdiff31_32);</div>
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Secondly, for cluster-based permutations (ft_freqstatistics), can you set the seed using cfg.randomseed? In the documentation, we've seen it used for ft_componentanalysis, but we weren't sure if it also worked for ft_freqstatistics. We have it running with
no errors, but wanted to make sure since we didn't see the parameter cfg.randomseed used directly in ft_freqstatistics. If not, is there a way to set the seed?</div>
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Best,</div>
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Annie</div>
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