numerical chart analysis

What Is Numerical Chart Analysis?

Numerical chart analysis renders polygraph decisions based exclusively on numeric values assigned to physiological responses. It does not consider extrapolygraphic information. Its four components are: feature identification, numerical value assignment, computation, and decision rules. Methods include Backster, Federal, Matte, Horizontal, Utah, and computerised algorithms.

Professional Standards

The American Polygraph Association Standards of Practice govern the use of polygraph techniques and scoring methods. Only validated techniques with published peer-reviewed research support should be used for diagnostic purposes. The test data analysis method must be approved and applied consistently to ensure reliable and defensible results.

Research Basis

For access to the published research supporting polygraph techniques and scoring methods, visit the polygraph research database. Understanding the empirical foundation of each technique is essential for practitioners, researchers, and those evaluating polygraph evidence.

Professional Context

This concept forms part of the knowledge base expected of qualified forensic psychophysiologists. Training at APA-accredited schools covers the theoretical foundations, practical applications, and research evidence underlying all aspects of polygraph methodology. Ongoing continuing education ensures practitioners stay current with developments in the field.