TRACK: a FORTRAN program for calculating the Foulkes-Davis tracking index

Area of Science:

• Biostatistics
• Quantitative Biology
• Data Analysis

Background:

• Understanding variability in biological measurements is crucial.
• Assessing the stability of individual measurement trajectories over time is important.
• The Foulkes-Davis tracking index provides a statistical measure for curve non-intersection.

Purpose of the Study:

• To present a computational program for calculating the Foulkes-Davis tracking index.
• To enable researchers to quantify the probability of non-crossing measurement curves for two individuals.
• To facilitate the assessment of measurement curve stability and individual distinctiveness.

Main Methods:

• Development of a software program implementing the Foulkes-Davis tracking index calculation.
• Utilizing statistical algorithms to determine the probability of curve non-intersection.
• Inputting measurement data for two individuals to generate the index value.

Main Results:

• The program successfully calculates the Foulkes-Davis tracking index.
• The index provides a quantitative measure of the probability that measurement curves will not cross.
• Demonstration of the program's utility in assessing tracking stability.

Conclusions:

• The developed program offers a valuable tool for biostatistical analysis.
• The Foulkes-Davis tracking index aids in distinguishing individual measurement patterns.
• This method enhances the understanding of variability and stability in longitudinal data.