**Step 4. Collecting Utilization Statistics**

With AnyLogic, you can collect complicated statistics whenever you need them. The objects of the Enterprise Library are already capable of collecting the basic statistics. All you need is to turn the statistics collection for the object on, as it is disabled by default to speed up the model execution. Since we have already done this earlier, now we are ready to view the statistics collected for the flowchart objects with charts.

We want to observe how mean ATM utilization and mean queue length change with time.

**Add a bar chart to indicate mean ATM utilization**

- Open the
**Analysis**stencil of the**Palette**view. This stencil contains charts and data objects used for collecting data and performing various statistical analysis on them. Drag the**Bar Chart**element from the stencil into the graphical editor and then resize it. - Go to the
**Properties**of the chart. Click**Add Data Item**to add data item to be displayed by this chart. - Modify the data item's
**Title**:*ATM utilization*. - Type
`ATM.statsUtilization.mean()`as the**Value**of the data item. Here`ATM`is the name of the**Delay**object we created. Each**Delay**object has`statsUtilization`data set that collects statistics on the object utilization. The`mean()`is the function that returns the mean value measured. You can use other methods to get statistical values, such as`min()`and`max()`. You can find the list of all the methods on the StatisticsContinuous page.

**Add a bar chart to indicate mean queue length**

- Add one more bar chart in the same way. Resize it to look like the one in the figure.
- Open the
**Appearance**tab of the**Properties**view and choose the first option from the**Bars Direction**section to make bars grow to the left. - Add a data item to be displayed by the chart. Set
**Title**:*Queue length*and**Value**:`queue.statsSize.mean()`Here`statsSize`is the data set of type StatisticsContinuous that collects the statistics on the Queue size.

Run the model and observe the ATM utilization and mean queue length with just created charts.