You mentioned lots of missing date data. Have you looked at the original data with, say Excel? Or even Word? Are the dates actually missing?
If not, the likely culprit is some failure at reading in the data.
We aren't expecting you build models to answer the question about what appears to be associated. Is that where you were stuck? We expected you would do it using graphical methods or descriptive statistics. Though you are welcome to try models to see which variables are selected.