I am planning on using on using multivariate latent differential equation modeling for my MA thesis. I will have the opportunity to plan for the parameters, methods, and measurements required to do so. But currently, I am attempting to utilize one of these derivative estimation methods on some data I currently have. Specifically, I have 3 measurements of PTSD, Cortisol, and Coping Self-Efficacy. The downside is that there are 50 participants and the occasions are not equally spaced (e.g., Time 1 is 1 week after traumatic event, Time 2 is 1 month, and Time 3 is 3 months). Is there a way I can still use this data to create a dynamic (DiffEq) multivariate model to better understand the process of this system of variables?
If not, I understand. From my understanding of reading Boker's and Deboeck's articles and book chapters, this should not work. I just felt like it could not hurt to ask. Any help is appreciated :)