positive_definite

  1. M

    Non-positive definite matrix and second order confirmatory factor analysis

    For my research I'm using SEM to model the relation between a couple of variables. All scales have been used in a 7 point likert format and most have been validated before in other research. In my dataset however, I have my doubts whether some these scales are truly measuring different concepts...
  2. T

    LISREL - Model does not converge, Matrix not positive definite

    Hello, I have imported a large amount of data (250 observations, 15 variables) and defined a path diagram to develop SEM. But after building simplix syntax and running lisrel syntax, it says that the model does not converge and in the output file, following are the errors: Matrix to be...