Simulation statistics
This reference lists the tabs of the Simulation Statistics window that opens after a run, and defines the statistics they show. Saving and exporting results, and comparing saved runs, are covered in Run a simulation.
Tabs
| Tab | Shows |
|---|---|
| Model | Totals across the whole run — for example, the total cost — plus model variables (a table variable's final contents open from the icon under its name) and each scoring function's score, in a column named after the function. |
| Processes | Case statistics per process. Each pool in the diagram is one process; every case counts as one observation. With three cases working 4, 6, and 11 hours, Working Time - Mean is 7 hours. |
| Activities | CaseCase A single instance of a process — for example, one customer order, invoice, or support ticket. An event log groups events by case ID. statistics per individual activityActivity A named step in a process (e.g. "Approve Invoice"). Each event in an event log records one activity occurrence for one case., plus counts and the cost split into Fixed Cost (per-case cost set on the Task tab) and Resource Cost (cost of the resources used). |
| Resources | Resource state statistics and resource pool statistics per resource group. With three Persons in Sales working 20, 22, and 27 days of a 90-day run, Working Time - Mean is 23 days. |
| Resource Instances | Resource state and cost per individual resource instance — the three Persons above appear as three rows. |
Columns chooses which statistics display; every statistic is recorded and saved regardless. Each statistic offers the measures Min, Max, Mean, Sum, Standard Deviation, and Non-Zero Count (cost also Count and Variance).
Case statistics
| Statistic | Definition |
|---|---|
| Cycle TimeCycle Time The active processing time for an activity or sub-process, excluding waiting time. Used together with throughput time to separate delay from effort. | The total time taken — through the process, or through the activityActivity A named step in a process (e.g. "Approve Invoice"). Each event in an event log records one activity occurrence for one case.. |
| Blocked Time | Time waiting at input gates. |
| Capacity Wait Time | Time waiting because an activityActivity A named step in a process (e.g. "Approve Invoice"). Each event in an event log records one activity occurrence for one case. with Capacity was full. |
| Inactive Time | Time waiting because an activityActivity A named step in a process (e.g. "Approve Invoice"). Each event in an event log records one activity occurrence for one case. or required resource was out of schedule. |
| In Transition Time | Time spent on connector lines that have a duration. |
| Resource Wait Time | Time waiting to acquire resources. |
| Service Time | Cycle TimeCycle Time The active processing time for an activity or sub-process, excluding waiting time. Used together with throughput time to separate delay from effort. minus Inactive Time — total time not waiting on a schedule. |
| Wait Time | Cycle TimeCycle Time The active processing time for an activity or sub-process, excluding waiting time. Used together with throughput time to separate delay from effort. minus Working Time — total time waiting for any reason. |
| Working Time | Time actively worked, including overtime, excluding inactive time. |
Counts
On the Activities tab, each case state also has a count — the number of cases in that state at the same time. Working Count - Max is the most cases ever working at the activityActivity A named step in a process (e.g. "Approve Invoice"). Each event in an event log records one activity occurrence for one case. simultaneously; Total Count counts all cases at the activityActivity A named step in a process (e.g. "Approve Invoice"). Each event in an event log records one activity occurrence for one case. regardless of state.
Resource state statistics
| Statistic | Definition |
|---|---|
| Acquired Waiting Time | Acquired by a case but waiting for another resource to become available. |
| Idle Time | In schedule but not acquired by any case. |
| Out Of Service Time | Out of schedule and not working overtime. |
| Overtime | Out of schedule and working. |
| Working Time | Actively working on a case. |
Resource pool statistics
| Statistic | Definition |
|---|---|
| Hourly Cost | The cost per hour of the type while scheduled. |
| Per Use Cost | The cost charged when the resource is acquired. |
| Wait Queue Size | The number of cases waiting for this resource (Mean is time-weighted). |
| Non-Zero Waiting Time | The waiting time of each acquisition that could not be satisfied immediately. |
The Simulation Project tab
Selecting the Simulation Project object summarizes key statistics from every saved run; each scoring function adds a column of its own under the function's name. Each run also shows its approximate percentage change from the Baseline Run you select — green or red, with an up or down arrow. A column's menu (three vertical dots on the header) sets whether higher or lower values count as better and how many decimal places display. More decimal places resolve apparent contradictions: two runs can both display "4 hours" yet differ by 3% — the extra digits show the values actually compared.
Notes / constraints
- Utilization is relative to the modeled schedule and the modeled work only — see Resource utilization looks lower than expected.
Related
- Run a simulation — saving, exporting, and comparing runs
- Simulation shape properties — the properties these statistics measure
- Simulation properties — warmup time and case logging