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ERIC Number: ED318801
Record Type: Non-Journal
Publication Date: 1990-Apr
Pages: 20
Abstractor: N/A
Reference Count: N/A
Designing Your Own Rasch Analysis Program.
Linacre, John M.
Advantages and disadvantages of standard Rasch analysis computer programs are discussed. The unconditional maximum likelihood algorithm allows all observations to participate equally in determining the measures and calibrations to be obtained quickly from a data set. On the advantage side, standard Rasch programs can be used immediately, are debugged and accurate, and can report statistics that are difficult to calculate. On the disadvantage side, the user must have the correct hardware, conclusions based on numbers appearing in the output are not necessarily valid, and the effort involved in producing one's own program can be considerable. Guidelines for writing programs, including those that surpass standard programs, are provided; and sample output from a number of standard programs is examined for strong and weak points. Emphasis is on adequate and useful statistics presented as easily comprehended graphical output. Topics discussed include: estimated measure, standard error, goodness of fit, plotting fit, presenting the variable, and differential item functioning or bias. Eleven figures and a BASIC program for performing unconditional maximum likelihood estimations are provided. (TJH)
Publication Type: Reports - Evaluative; Speeches/Meeting Papers
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A