High level model comparison functionality?

[ChrisRackauckas]

a. Convert the MechBayes SEIRHD model to an SIRHD model by removing the E compartment. Compute the same six-week forecast that you had done in Question 1a and compare the accuracy of the six-week forecasts with the forecasts done in Question 1a.
b. Further modify the MechBayes SEIRHD model and do a model space exploration and model selection from the following models, based on comparing forecasts of cases and deaths to actual data: SEIRD, SEIRHD, and SIRHD models. Use data from April 1, 2020 – April 30, 2020 from the scenario location (Massachusetts) for fitting these models. Then make out-of-sample forecasts from the same 6-week period from May 1 – June 15, 2020, and compare with actual data. Comment on the quality of the fit for each of these models.
c. Do a 3-way structural model comparison between the SEIRD, SEIRHD, and SIRHD models.