On Thu, 26 Feb 2015, Randy Kesselring wrote: > At first this seemed a simple problem to me, but I have failed to > find a solution. I have a very large unbalanced panel data set > that I am having difficulty declaring as such. The data set > includes a numerical year variable and a numerical month variable > (1-12). Then, there are a large number of observations whose > numbers vary per month. Gretl had no problem reading the data > set, but it was read as undated. At first I thought I simply > needed a time index that included both the year and month > information in a single variable. So, I created this: series > tindex = year + month/100. This created the expected numerical > variable. But, when I tried to use this as an index variable in > the panel data structure declaration, it doesn't show up in the > drop down menu.
Try tindex = year*100 + month gretl is expecting an integer-valued index. Allin Cottrell
