The words incidence and incident can be considered synonyms. Therefore, incidents can be substituted for incidences.

If I may, it's not so. They are not synonyms. An incident is an occurrence whereas incidence is the frequency of occurrence. Example: There were several traffic jam incidents that occurred over time vs. over time, the incidence of traffc jams increased.

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Replying to:

The words incidence and incident can be considered synonyms. Therefore, incidents can be substituted for incidences.