About bookmark difficulty locations, the relationship between and within IRT models and RP values were compared by Spearman coefficient.
在 书签难度位置排序方面， 本研究以实徵与模拟资料， 以斯皮尔曼相关系數进行相（不） 同 IRT 模式， 不（相） 同 RP 值之间的比较；
Method of comprehensive evaluation, spearman rank relational coefficient and cluster analysis were employed.
研究方法综合评价法，秩相关系数法，聚类分析法。
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