Prediction grid data size

[sigmafelix]

The imputed dataset for the first study period is 525MB. The full space-time prediction grid will be 8,652,781 MB, which equals to 8.25 TB. Besides the feasibility of the prediction at such a large data (predicted outcomes will get a few thousandths of size, though), storage would be a problem. The total data size will increase linearly as additional study periods are accounted for. Perhaps we need to consider a DBMS to manage the data in case of the feature data getting too large to manage with qs, fst, or other file-based archives.