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In viral marketing, the K-factor can be used to describe the growth rate of websites, apps, or a customer base. The formula is roughly as follows: : (e.g. if each new customer invites five friends, ''i'' = 5) : (e.g. if one in five invitees convert to new users, ''c'' = .2) : This usage is borrowed from the medical field of epidemiology in which a virus having a k-factor of 1 is in a "steady" state of neither growth nor decline, while a k-factor greater than 1 indicates exponential growth and a k-factor less than 1 indicates exponential decline. The k-factor in this context is itself a product of the rates of distribution and infection for an app (or virus). "Distribution" measures the average number of people a host will contact while still infectious, and "infection" measures how likely an average person is to also become infected after contact with a viral host. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「K-factor (marketing)」の詳細全文を読む スポンサード リンク
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