HLM运行后View Output窗口显示“For starting values, data from 83 level-1 and 55level-2 records were used V11(GLS) is not positive-definite There is a problemin the fixed portion of the model.  Anear singularity is likely.  Possiblesources are a collinearity or multicollinearity among the predictors.  We suggest that you examine a correlationmatrix among the fixed effect predictors.”大概是存在共线性，不知道我理解的是否准确，但使用SPSS对共线性进行检查后并未发现严重的共线性，请问问题出在哪儿？