简述测验项目的筛选评价。
1.根据难度来筛选项目1;一般要求测验项目的难度可位于0.2—0.8或0.3—0.7之间;同时所有项目的平均难度则要求在0.5之间。2.根据区分度来筛选项目:区分度的提高会显著地提高测验的信度和效度,区分度在0.3以上就比较理想,但有些区分度在0.2—0.3之间的项目,如果能很好地体现测验目的,也应酌情予以保留。
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