What do subjective data typically relate to in property assessments?

Subjective data in property assessments primarily relate to personal judgment because it encompasses opinions, perceptions, and interpretations that are influenced by individual experiences or emotions. This type of data is often qualitative and can include factors such as an appraiser's perspective on a property's desirability, the condition of the neighborhood, or unique characteristics not easily quantified.

In contrast, the other options represent concrete aspects of data collection and assessment that are more objective. Concrete facts, quantifiable metrics, and statistical analysis all rely on measurable and observable information that can be verified and are foundational to a data-driven approach. They do not encompass the individual opinions or interpretations that characterize subjective data. Hence, personal judgment is the essence of subjective data, making it the correct answer.