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１６回应因数（Ｅｃｈｏｆａｃｔｏｒ）也是一种期刊获得引证程度的测度（ＥＦ）。它与影响因素（ＩＦ）相似但不同。Ｚｍａｉｃ和Ｍａｒｉｃｉｃ以及Ｓｉｍｅｏｎ于１９８９年在一篇讨论“ＳＣＩ”与期刊明显性关系的文章中，首次提出这一测度并定义如下式：Ｎｅ＝（Ｎｉ...
Echofactor is also a measure of the extent to which citation is cited (EF). It is similar but different to the influencing factor (IF). Zmaic and Maricic, and Simeon in 1989, in an article discussing the explicit relationship between “SCI” and periodicals, first proposed this measure and defined the following formula: Ne = (Ni ...