Hair degradation patterns in aquatic and soil environments - raw data

This dataset contains the results of a qualitative analysis of hair distribution based on a scale of human hair degradation created on the basis of microscopic observations.
Owing to the qualitative nature of the variables, non-parametric methods were applied, including the Friedman test and a series of stepwise logistic regressions to assess changes over time. Standard descriptive measures, such as the arithmetic mean, were used to visualize the degradation patterns in the figures.