15. The apparatus of claim 10 , wherein the document similarity evaluator is further configured to determine if the one or more second documents include a predetermined threshold of words or phrases included in the first document.
10. An apparatus for predictive coding of previously collected electronic discovery documents, the apparatus comprising: a computing platform including at least one processor, a memory in communication with the processor and a display in communication with the processor; a document coding application stored in the memory, executable by the processor and configured to receive a plurality of document coding inputs that each assign a review code to one of a plurality of first documents, which are associated with a case within an electronic discovery system and have been previously collected from one of a plurality of custodians associated with the case, wherein the review code indicates a level of relevancy or importance in relation to the case and at least one document coding input codes a first document as privileged; and a predictive document coding application stored in the memory, executable by the processor and including, a document similarity evaluator configured to (1) determine, in response to receiving each of the plurality of document coding inputs, if one or more second documents, which are associated with the case, have been previously collected from the plurality of custodians and are pending review, are similar to or same as the first document, and (2) determine, in response to receiving the at least one document coding input that codes the first document as privileged, determining, via a computing device, if one or more third documents, which are associated with other cases in the electronic discovery system, have been collected from the plurality of custodians and are pending review are same as the first document, a code assignor configured to (1), in response to determining that the second documents are same as the first document, automatically assign a review code assigned to the first document to the one or more second documents that are the same as the first document and, (2) in response to determining that the third documents are same as the first document, automatically assign the privilege code to the one or more third documents that are the same as the first document, a document remover configured to remove the one or more second documents that are the same as the first document from a plurality of pending review documents based on the assignment of the review code, wherein the pending review documents are included in a document review assignment currently being reviewed by a reviewer, and a confidence indicator presenter configured to present, on the display, the one or more second documents that are similar to the first document and a confidence indicator that indicates a level of similarity between the first document and a presented second document, wherein the reviewer makes a determination based on the confidence indicator as to whether the presented second document reaches a level of similarity to the first document to justify assigning the review code to the presented document.