Although it has proven difficult for me, I have what seems to be a simple problem. I want to create a measure to subtract the prior value in the same column from the current row. In the screenshot below, I show two columns for columns I have in my table. I also show a column (labeled Difference) that represents the measure I want to create. I show the logic I want to use to create the column.
I accepted both of your replies as solutions because they both were helpful. I found an alternate way. I REALLY felt like I would need to use EARLIER in some fashion; not only based on input received from both of you, but also because that was here my head was at prior to posting. Here is my final table: