ratesshift
Ratesshift is a term used in data analysis to describe a systematic change in the relative rates of two quantities across time, conditions, or groups. It is a descriptive concept rather than a standalone statistical test, capturing when the ratio of two rate measures moves in a meaningful way even as the individual rates themselves change.
Definition and calculation: Suppose two quantities with rates R1 and R2 are measured at baseline and follow-up.
Interpretation: A ratesshift near 1 indicates little change in the relative relationship; values above 1 indicate
Applications: Ratesshift is used in epidemiology to compare disease incidence across demographic groups, in finance to
Limitations: It can be affected by small counts, confounding factors, and changes in population structure. Ratesshift