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bifactor's Issues

To-do list

  • Handle missing data.
  • Partially oblique rotation with zeros in arbitrary positions.
  • Implement the truncated Newton method for factor extraction.
  • Develop alternative line-search methods (backtracking is the only one available right now).
  • Manage empty cells in the contingency tables of the polychorics.
  • Asymptotic covariance of the polychorics.
  • Fix the standard errors for mixed criteria (arrange well the Hessian matrix).
  • Information method for standard errors in maximum likelihood.
  • Implement new factor extractions (GLS, DWLS, MINRANK, etc.)
  • Omega reliabilities for bifactor models (done in R).
  • Scaled fit indices.
  • Confidence intervals for fit indices.
  • Unbiased RMSR.
  • Tetrads analysis (RMSR with tetrads; done in R).
  • Expand bifactor:::CFA to bifactor:::SEM.
  • ESEM.

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