First Sentence:
The only type of data that the IRT programs currently can handle is fixed format with one or more lines per record (case) and one-character response codes.
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Key Phrases - Statistically Improbable Phrases (SIPs):
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variable format statement, bifactor analysis, classical item statistics, main test items, score command, original response data, full information item factor analysis, attempting item, bifactor solution, item information indices, normal response function, estimated latent distributions, format statement describing, item information curves, science assessment test, bifactor model, fractional quadrature, response codes field, weights for these distributions, generalized partial credit model, item parameter estimation, standardized difficulty, syntax wizard, test information curves, uncorrelated group factors
Key Phrases - Capitalized Phrases (CAPs):
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Input Parameters, Monte Carlo, Default None, Default Supplied, New Analysis, Cancel Help, Scoring Prior Latent Distribution, Assign Item, Item Keys, Back Next, Calibration Options, Data Options, Item Parameter Prior Constraints, Item Parameter Starting Values, Fixed Theta, Text Parameters, Score Options, Ability Figure, Calibration Prior Latent Distribution, Enter Values, External Ability, Item Parameter Estimation Type of Data, Line Parameters, Default All, Fixed-Column Records
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