Tangential question - the study calls itself longitudinal and was conducted over 16 weeks. I was not familiar with the word so I googled longitudinal: > A long

Tangential question - the study calls itself longitudinal and was conducted over 16 weeks. I was not familiar with the word so I googled longitudinal: > A longitudinal study (or longitudinal survey, or panel study) is a research design that involves repeated observations of the same variables (e.g., people) over long periods of time, often many decades (i.e., uses longitudinal data).