I bought your book "Power Pivot for the Data Analyst". It would be much easier to follow if you actually had the sample data used in the exercises. I was able to follow the beginning exercises using the demo.txt file and storeinfo but the rest of the excel fies that appear to correspond to each chapter are more or less empty and only have the link to purchase the book. Perhaps I am just missing something here but I would have assumed that you would have sample dta that corresponds to each exercise in the book. Am I supposed to findmy own data to use for this?