A function to compute and report modifications which would improve fit.
You will probably use umxMI instead
xmuMI(model, vector = TRUE)an mxModel to derive modification indices for
= Whether to report the results as a vector default = TRUE
Other xmu internal not for end user: umxModel,
  xmuHasSquareBrackets,
  xmuLabel_MATRIX_Model,
  xmuLabel_Matrix,
  xmuLabel_RAM_Model,
  xmuMakeDeviationThresholdsMatrices,
  xmuMakeOneHeadedPathsFromPathList,
  xmuMakeTwoHeadedPathsFromPathList,
  xmuMaxLevels, xmuMinLevels,
  xmuPropagateLabels,
  xmu_check_levels_identical,
  xmu_dot_make_paths,
  xmu_dot_make_residuals,
  xmu_start_value_list