1. A system or network incident detection and analysis computing system, comprising: at least one processor; a communication interface communicatively coupled to the at least one processor; and at least one memory storing computer-readable instructions that, when executed by the at least one processor, cause a textual analysis computing device of the system or network incident detection and analysis computing system to: receive and analyze historical system or network incident data including a plurality of historical incidents; quantify each historical incident of the plurality of historical incidents to determine a quantified magnitude of an impact of each historical incident; compare the quantified magnitude of the impact of each historical incident to a predetermined threshold to identify historical incidents having a quantified magnitude at or above the predetermined threshold and historical incidents having a quantified impact below the predetermined threshold; group historical incidents having a quantified impact at or above the predetermined threshold; group the historical incidents having a quantified impact below the predetermined threshold; perform a keyword analysis on the incidents having a quantified impact at or above the predetermined threshold to identify a first plurality of keywords in the incidents having a quantified impact at or above the predetermined threshold; analyze the identified first plurality of keywords to identify at least one combination of keywords of the first plurality of keywords having a correlation to at least one incident having a quantified impact at or above the predetermined threshold; perform a keyword analysis on the incidents having a quantified impact below the predetermined threshold to identify a second plurality of keywords in the incidents having a quantified impact below the predetermined threshold; analyze the identified second plurality of keywords to identify at least one combination of keywords of the second plurality of keywords having a correlation to at least one incident having a quantified impact below the predetermined threshold; based on the identified at least one combination of keywords of the first plurality of keywords, determine inclusion criteria for identifying incidents likely to have an impact above the predetermined threshold; based on the identified at least one combination of keywords of the second plurality of keywords, determine exclusion criteria for identifying incidents not likely to have an impact above the predetermined threshold; receive an incident and associated data; parse the associated data to identify one or more keywords; and evaluate the incident by comparing the identified one or more keywords to the inclusion criteria and the exclusion criteria to determine whether the incident is likely to have an impact above the predetermined threshold.