请高人指点
问题1:在信度分析时有警告:The space saver method is used. That is, the covariance matrix is not calculated or used in the analysis.是怎么回事?
问题2:信度结果中Reliability Statistics,Cronbach's Alpha=.010 是不是太低了,数据看不出什么问题呀。
问题3 : Item-Total Statistics分析中,当某个变量删除后怎么信度为-0.018,系统提示:The value is negative due to a negative average covariance among items. This violates reliability model assumptions. You may want to check item codings.
说是什么协方差为负违背了信度分析的假设,检查item codings,是指检查数据吗?从数据中也看不出什么问题?请高手指点,在此谢过了。