4.正态分数变换(Normal Score Transformation) 正态分数变换适用于等级数据。有许多事物的特征只能加以判断等级,而不能用尺度衡量。比方说,临床医生或病人对于某些慢性病病情的变化往往做“改进”、“如旧”,“退步”等评语而不能用客观尺度表示。但如将这类等级变换为“正态分数”则可进行统计分析。 4. Normal Score Transformation Normal score transformation applies to the level data. There are many things whose characteristics can only be judged by grades, not scales. For example, clinical doctors or patients often do “improvement”, “if old”, “regressive”, etc., for changes in the condition of certain chronic diseases and cannot use objective measures. However, statistical analysis can be performed if these classes are transformed into “normal scores.”