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wiki/concepts/KFactor.md
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wiki/concepts/KFactor.md
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title: "K-Factor"
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type: concept
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tags: ["viral", "metrics", "growth", "referral"]
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last_updated: 2026-04-26
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---
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## Definition
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病毒系数(K-factor)——衡量有机传播效率的指标。K = 邀请率(每个用户平均发送邀请数)× 接受率(每个邀请的平均接受转化率)。K > 1.0 意味着每个用户平均能带来超过一个新增用户,实现指数级自然增长;K < 1.0 则增长需要依赖外部获客渠道。
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## Formula
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```
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K-factor = 邀请率 × 接受率
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= (发送邀请数 / 总用户数) × (接受邀请数 / 发送邀请数)
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```
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## Interpretation
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| K-factor | Growth Pattern |
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|----------|---------------|
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| K > 1.0 | 指数级自然增长(病毒式传播)|
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| K = 1.0 | 线性增长(每位用户带来一位新用户)|
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| K < 1.0 | 需要外部获客渠道补充 |
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## Source
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- [[marketing-growth-hacker]](Marketing Growth Hacker Agent)
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## Aliases
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- Viral Coefficient
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