search for: haebara

.... What I did not know is that, unlike ICL or Bilog, ltm does not constrain discriminations to be positive. This means that it can be used to analyze bipolar data (think political sciences). There are also two new features: (i) Tamaki Hattori has kindly provided me with the original 1980 article of Haebara, and he has written code for the symmetrical versions of the Haebara and Stocking-Lord scaling methods, now available as an option; (ii) I have finally added a wle function for the bias-corrected estimates of ability aka Warm's estimates Kind regards Ivailo Partchev ___________________________...

.... What I did not know is that, unlike ICL or Bilog, ltm does not constrain discriminations to be positive. This means that it can be used to analyze bipolar data (think political sciences). There are also two new features: (i) Tamaki Hattori has kindly provided me with the original 1980 article of Haebara, and he has written code for the symmetrical versions of the Haebara and Stocking-Lord scaling methods, now available as an option; (ii) I have finally added a wle function for the bias-corrected estimates of ability aka Warm's estimates Kind regards Ivailo Partchev ___________________________...

...raded response model -Partial credit model, MD partial credit model -Generalized partial credit model, MD generalized partial credit model -Nominal response model, MD nominal response model -Multiple-choice model, MD multiple-choice model Unidimensional Calibration Methods: -Mean/Mean -Mean/Sigma -Haebara -Stocking-Lord Multidimensional Calibration Methods: -Reckase-Martineau (least squares with oblique procrustes rotation) -MD Haebara -MD Stocking-Lord --For the later two methods there are three dilation approaches - Oshima-Davey-Lee (oblique rotation) - Li-Lissitz (orthogonal procrustes rotat...

...raded response model -Partial credit model, MD partial credit model -Generalized partial credit model, MD generalized partial credit model -Nominal response model, MD nominal response model -Multiple-choice model, MD multiple-choice model Unidimensional Calibration Methods: -Mean/Mean -Mean/Sigma -Haebara -Stocking-Lord Multidimensional Calibration Methods: -Reckase-Martineau (least squares with oblique procrustes rotation) -MD Haebara -MD Stocking-Lord --For the later two methods there are three dilation approaches - Oshima-Davey-Lee (oblique rotation) - Li-Lissitz (orthogonal procrustes rotat...

...ems. The package supports eight IRT models and four calibration methods. Dichotomous Models: 1PL, 2PL, 3PL Polytomous Models: -Graded response model -Partial credit model -Generalized partial credit model -Nominal response model -Multiple-choice model Calibration Methods: -Mean/Mean -Mean/Sigma -Haebara -Stocking-Lord Any combination of dichotomous and polytomous items can be supplied with intermingled unique and common items for as many items and groups as system memory allows. Linking constants are computed and returned for all the calibration methods, and (if desired) ability and/or item param...

...ems. The package supports eight IRT models and four calibration methods. Dichotomous Models: 1PL, 2PL, 3PL Polytomous Models: -Graded response model -Partial credit model -Generalized partial credit model -Nominal response model -Multiple-choice model Calibration Methods: -Mean/Mean -Mean/Sigma -Haebara -Stocking-Lord Any combination of dichotomous and polytomous items can be supplied with intermingled unique and common items for as many items and groups as system memory allows. Linking constants are computed and returned for all the calibration methods, and (if desired) ability and/or item param...