Technical note: Issues with proposed chance match probabilities in barefoot morphology.

Area of Science:

• Forensic science
• Biometrics
• Anthropometry

Background:

• Chance match probabilities are used in forensic disciplines.
• Previous studies proposed methods for barefoot morphology.
• The validity of these methods is questioned.

Purpose of the Study:

• To critically evaluate proposed chance match probabilities for barefoot morphology.
• To identify and explain errors in existing statistical approaches.
• To assess the scientific validity of these probabilities.

Main Methods:

• Technical review of existing literature on barefoot morphology probabilities.
• Analysis of statistical assumptions, including data independence.
• Examination of the application and interpretation of principal component analysis (PCA).

Main Results:

• Several proposed chance match probabilities contain critical errors.
• A key error is the assumption of independence in barefoot data.
• Principal component analysis (PCA) does not generate statistically independent variables, contrary to claims.

Conclusions:

• The assessed chance match probabilities for barefoot morphology are scientifically flawed.
• Misapplication of statistical methods like PCA undermines their validity.
• These probabilities should not be used to support the scientific foundation of the discipline.