PA chart for monthly averages

[KB15]

I'm looking to create a chart to show what the average open to resolved times are per month. This is what I currently have and I want to know if I need to create more indicators or make adjustments:

I have an automated indicator "Summed Duration of Resolve Incidents" as is filtered by an assignment group. Unit is set to hours. It's also using the script Incident.ResolveTime.Hours. Source is Incidents.Resolved.

I have a formula indicator "Average resolution time" set as: "Summed Duration of Resolve Incidents / Resolved Incidents / 24". Unit is set to days. The Resolved Incidents indicator is also filtered by the same group as in the Summed Duration of resolved Incidents.

I know I can get a daily score. What would I need to get to show monthly averages? Would it simply be setting the time series in the chart to "By Month AVG"?

This is the chart if I set it to By Month AVG. I'm just not sure of the accuracy because I'm capturing the data by hour.

[Slawek_Radziewi · Accepted solution]

We are using exactly the same methodology so I think it is best approach. We even calculate seconds not hours.

Even if there is some inaccuracy you are comparing all incidents this way so you see relation of data between months. What is most important here is to get comparison and see trend.