RESEARCH-GRADE ASSESSMENT

Adaptive Cognitive Intelligence Test

A computerized adaptive test (CAT) employing Item Response Theory (IRT) for precision measurement of fluid intelligence. Features a calibrated 120-item bank, real-time ability estimation using Maximum A Posteriori (MAP), and adaptive item selection to minimize standard error while maximizing measurement efficiency.

Scientific Disclaimer

This is a demonstration platform designed for educational purposes. While it implements sophisticated psychometric methodologies (IRT, CAT, MAP estimation), it cannot replace professionally-administered assessments. Valid IQ testing requires controlled conditions, trained examiners, and norm-referenced standardization (WAIS-IV, Stanford-Binet, Raven's APM). Results should be interpreted as approximate estimates with significant error margins (±15-20 IQ points).

Adaptive Algorithm

Real-time item selection based on IRT information functions. Each question is optimally calibrated to your estimated ability level (θ).

MAP Estimation

Maximum A Posteriori Bayesian estimation provides stable ability estimates even with limited responses, using prior distributions.

120-Item Bank

Calibrated question pool with psychometric parameters (difficulty b, discrimination a) spanning the full ability spectrum.

Precision Testing

Stops when Standard Error of Measurement (SEM) reaches target threshold, ensuring reliable ability estimates.

Multi-Domain

Assesses fluid intelligence across visual-spatial, numerical-quantitative, and verbal-logical reasoning domains.

Full Report

Comprehensive psychometric analysis including confidence intervals, percentiles, domain subscales, and measurement precision.

Psychometric Specifications

Model: 2PL IRT (Difficulty + Discrimination)
Estimation: Maximum A Posteriori (MAP)
Selection: Maximum Fisher Information
Stopping: SE < 0.30 or 40 items
Scale: θ metric (M=0, SD=1)
Conversion: IQ (M=100, SD=15)