Longitudinal data

A researcher reached out to me a few weeks ago. They were trying to generate longitudinal data that included irregularly spaced follow-up periods. The default periods generated by the function addPeriods in the simstudy package are $\{0, 1, 2, ..., n - 1\}$, where there are $n$ total periods. However, when follow-up periods required more specificity, such as $\{0, 90, 180, 365\}$ days from baseline, users had to manually add them. [Read More]