拜求各位有过相同经历的前辈予以指导，实在是算不出来了。以下是我的模型：
这是第二个对话框。第一个是这样的：

The sample moment matrix is not positive definite. It could fail to be positive definite for any of the following reasons：
  1. The sample covariance matrix or the sample correlation matrix contains a data entry error.
  2. The observed variables are linearly dependent（perhaps because the sample size is too small）.
  3. The sample covariance matrix or sample correlation matrix was computed from incomplete data using the method of “pairwise deletion”.
  4. The sample correlation matrix contains correlation coefficients other than product moment correlations（such as tetrachoric correlations）.
For maximum likelihood estimation only，it may be appropriate to check“allow non-positive definite sample covariance matrices”in the “Analysis Properties”window，or to use the Nonpositive method.

请问这是数据本身原因吗？样本量78个不算小，但是确实可能不均匀。至少一个采样方差为0或负值怎么样能解决？必须删除一部分数据吗？如何删除？
多谢赐教啦！叩拜!