Software
Psychometric / IRT Statistical Software
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flexMIRT ®
flexMIRT® is software specifically designed for the analysis of item response data, such as what is obtained from a quality-of-life measure, attitude survey, or educational test. flexMIRT is able to fit a wide variety of IRT models to model both unidimensional and multidimensional structures (such as when some items measure more than one concept) and provides a wide variety of item and model fit statistics and scoring methods.
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IRTPROTM
IRTPRO™ is an advanced application for item calibration and test scoring using item response theory (IRT). It comes with an intuitive graphical user interface and offers built-in production quality IRT graphics. Suitable for educators, students, researchers, and assessment organizations, IRTPRO™ has become increasingly popular in the educational, psychological, social, and health sciences. IRTPRO™ handles any combination of unidimensional or multidimensional versions of popular IRT models, in multiple groups.
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PARSCALE
The flexibility and the wealth of information provided by this program have kept it in regular use by researchers around the world. Features include: One, two, and three-parameter logistic models, Samejima’s model for graded responses, Master’s partial credit model, generalized partial credit model, analysis of rating scale items such as open-ended essay questions, analysis of multiple-choice items, differential item functioning (DIF), analysis of mixtures of item types, rater’s-effect analysis, multiple-group polytomous item response models, and presentation quality IRT graphics that can be imported in Word, Access, and other programs.
B
BILOG-MG
BILOG-MG is an extension of BILOG that is designed for the efficient analysis of binary items, including multiple-choice or short-answer items scored right, wrong, omitted, or not-presented. BILOG-MG is capable of large-scale production applications with unlimited numbers of items or respondents. It can perform item analysis and scoring of any number of subtests or subscales in a single program run. All the program output may be directed to text files for purposes of selecting items or preparing reports of test scores.
Statistical Software
HLM Software
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HLM
HLM fits models to outcome variables that generate a linear model with explanatory variables that account for variations at each level, utilizing variables specified at each level. HLM not only estimates model coefficients at each level, but it also predicts the random effects associated with each sampling unit at every level.
S
SuperMix
SuperMix combines the functionality of four mixed-effects programs, MIXREG, MIXOR, MIXNO, and MIXPREG, developed by Donald Hedeker and Robert Gibbons into a single application to provide estimates for mixed-effects regression models. SuperMix will fit models with continuous, count, ordinal, nominal, and survival outcome variables with nested data, allowing for up to three levels of nesting.
A
AUXAL
Fast, comprehensive analysis of data from longitudinal growth studies is now available on your desktop with the AUXAL program from SSI. The program performs both structural and nonstructural auxological analysis of human growth in standing height or recumbent length. It provides accurate fitting or smoothing of growth curves for height, velocity, and acceleration and displays the height and velocity curves in publication quality graphic output.
SEM Software
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LISREL
LISREL is a 64-bit application for standard and multilevel structural equation modeling. These methods are available for the complete and incomplete complex survey data on categorical and continuous variables as well as complete and incomplete simple random sample data on categorical and continuous variables. LISREL represents a seminal development in the history of Structure Equation Modeling (SEM).
