Objective To relax assumption of carryover effects in analysis of variance for cross-over designs and explore mixed effects model.

目的放宽交叉设计方差分析对残留效应假定和探讨交叉设计混合效应分析模型。

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The utility model has the beneficial effects of good flexibility, long retention time and abrasion resistance, easy carryover, good decorative effects, and collection value.

本实用新型有益效果为：具有很好的柔韧性，保存时间长且不易磨损，携带方便，达到了良好的装饰效果，同时具有收藏价值。

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