In large scale standardized tests, the test scores, before release, have to undergo a series of transformation processes, including score weighting, score equating, and score normalization, etc.
为了使分数带有大量信息，便于用户使用，大规模标准化考试在最终报道考试成绩前，分数要经过加权处理、等值处理、正态化转换等一系列转换过程。
It converts the scores of the given testees' population on test form X into that of the observed score distribution on test form Y, so it is an observed score equating method.
核等值法通过转换给定考生总体在X卷上的观察分分布，得到Y卷上的观察分分布，因此其本质是观察分等值。
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