89bb95088fb4b82d54c1b5a9a1794d7b1a35bd71
Box-A2 has no data past ~day 13, so the full-range days x tDCS interaction extrapolates A2's slope and is confounded (spuriously significant, wrong sign). Add the _d0_13 window (equal anchor coverage) and a report warning when the two groups' day coverage is unequal. In the fair 0-13 window the interaction is n.s. with a POSITIVE slope diff and the Day-1 tDCS effect is n.s. -- matching the paper's 'equal on Day 1' direction (underpowered at n=8). Suite 32/32. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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