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Table 1 Definition of three metrics that describe an information cascade

From: How did Ebola information spread on twitter: broadcasting or viral spreading?

Metrics Definitions
Cascade size The number of total retweets received by an original tweet. The cascade size describes the popularity of the seed message
Cascade scale The percentage of all retweets that were retweeted directly from the original tweet. The higher the percentage is, the more likely the diffusion cascade is dominated by the broadcast model
Cascade depth The number of generations in a diffusion path. A large depth value may suggest a long chain of information diffusion and thus implies viral spreading