# Entry / Exit Analysis

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Entry / Exit Analysis lets you use the entry (first) or exit (last) in-session dimensions across different types of analysis.

## Supported metric types

Entry / Exit analysis supports the following metric types:

- **Uniques**: The count of unique users
- **Event totals**: The total number of events
- **Session totals**: The total count of sessions
- **PROPSUM**: The sum of a group-by property value

## Enable Entry / Exit Analysis

Apply Entry or Exit semantics to any supported metric type in the Data Table.

To enable this analysis:

1. In a data table with at least one event or metric, click the Options menu in the header of the column you want to enable the analysis on.
2. Click _Enable Entry/Exit Analysis_ in the options menu. The _Enable Entry/Exit Analysis_ dialog appears.
3. Select how to apply group-by properties to the column:

   - **Default**: Uses the standard group-by setting for the column
   - **Entry**: Groups data by the first non-null property value of an active event in a session that contains the specified event.
   - **Exit**: Groups data by the last non-null property value of an active event in a session that contains the specified event.

> **Note:**
>
> Data table columns support either Attribution **or** Entry / Exit analysis, but not both.

4. Click **Apply**.

## Processing flow

For each session that contains the event specified in the column:

1. Amplitude identifies all relevant sessions.
2. For each session:

   - Amplitude extracts the first property value of an active event for Entry Analysis.
   - Amplitude extracts the last property value of an active event for Exit Analysis.
3. Amplitude uses these values to compute session-based metrics.

## Calculations

Amplitude uses the following formulas to compute the metrics that support Entry and Exit analysis:

| Metric Type | Formula |
| --- | --- |
| Uniques | `UNIQUES(A)` |
| Event totals | `TOTALS(A)` |
| Prop sum | `PROPSUM(A)` |
| Session totals (Entry analysis) | Like **Session Entries** |
| Session totals (Exit analysis) | Like **Session Exits** |