Here is the model I am using: Data: Date Hours Worked FullDay 9/4/2013 7:13:00 No 9/6/2013 10:52:00 Yes 9/7/2013 6:43:00 No 9/10/2013 9:26:00 Yes FullDay column to be updated as 'Yes' if previous day worked hours is at least 8 hours. How can I calculate whether or not the previous row value is...