{ "_id": "6ad13bc90edca5be25021aab", "Package": "PP", "Type": "Package", "Title": "Person Parameter Estimation", "Version": "1.0.0", "Date": "2026-10-14", "Authors@R": "c(\nperson(given = \"Manuel\",\nfamily = \"Reif\",\nemail = \"manuel.reif@gmail.com\",\nrole = c(\"cre\", \"aut\")),\nperson(given = \"Jan\",\nfamily = \"Steinfeld\",\nemail = \"jan.d.steinfeld@gmail.com\",\nrole = \"aut\",\ncomment = c(ORCID = \"0000-0001-9853-8260\"))\n)", "Description": "Estimation of person parameters (abilities) for the 1, 2,\n3 and 4 parameter logistic model, the (generalized) partial\ncredit model and tests that mix dichotomous and polytomous\nitems, under the assumption that the item parameters are known\nand fixed: maximum likelihood, weighted likelihood (Warm, 1989\n), maximum and expected a posteriori\nand robust estimation (Schuster and Yuan, 2011\n). Further features are jackknife\nestimates (Wainer and Wright, 1980 ),\nplausible values, the person fit statistics lz, lz* (Snijders,\n2001 ), infit and outfit, and the\nsimulation of response data. Models fitted with the 'eRm'\npackage can be passed on directly. 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