# Closed Funnel和Open Funnel的定义
> **漏斗分析（Funnel Analysis）是一种关键行为路径追踪方式，帮助产品或数据团队观察用户在一系列事件中的转化情况**
### **funnel支持两种漏斗类型：**
* **Closed Funnel（闭合漏斗）**
* **Open Funnel（开放漏斗）**
并且漏斗支持两种计数方式：
* **Events**：统计事件数
* **Users**：统计用户数
1\. Closed Funnel（闭合漏斗)
**定义：**
* **事件顺序必须完全遵守设定顺序**
* **每一步必须连续发生**
* 任意步骤缺失或顺序错误，后续事件将 **不再计入**
**举例：**
假设漏斗步骤为：\
**Step 1: A → Step 2: B → Step 3: C → Step 4: D**
| 用户 | 事件触发顺序 | 计入层级 | 说明 |
| -- | ------------- | ---------- | --------------- |
| U1 | A → B → C → D | A, B, C, D | 严格按顺序，全部计入 |
| U2 | A → B → D | A, B | 缺少 C，停止在 B |
| U3 | A → C | A | B 缺失，C 不计入 |
| U4 | B → C → D | | 起始事件 A 缺失，不纳入计算 |
#### 2. Open Funnel（开放漏斗）
**定义：**
* **要求事件依照指定顺序出现**
* **可以中途结束，但不能跳跃步骤继续推进**
* 一旦中断（跳过步骤），**后续事件即不再计入**
**举例：**
事件顺序：A → B → C → D
| 用户 | 实际事件触发顺序 | 计入层级 | 说明 |
| -- | ----------------- | ---------- | ---------------------------- |
| U1 | A → B → C → D | A, B, C, D | 顺序完整，全部计入 |
| U2 | A → B → D | A, B | 缺 C，停止在 B |
| U3 | A → C | A | B 缺失，不能继续推进到 C |
| U4 | A → C → D | A | 中间缺 B，C 和 D 不计入 |
| U5 | B → C → D | B, C, D | 缺少起始事件 A，不纳入漏斗 |
| U6 | A → B → C → C → D | A, B, C, D | 重复事件不会影响推进（只看顺序） |
| U7 | A → C → B → D | A | 虽然都有，但 B 出现在 C 后，违反顺序规则，仅计 A |
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