I am trying to show cumulative percentages on a bar graph by Hour interval by Category. Some of the Categories aren't showing the full 100% when they skip an Hour for activity. For example, 10 at 1 hour = 50%, 0 at 2 hours, and then the last 10 are at 3 hours= 50%. My calculation for percentage is using the Previous_value(0) function. no activity is showin up for hour 3. Only the activity for Hour 1 is showing. Any ideas?