13. A computer program product for classifying documents, the computer program product comprising: a non-transitory computer readable medium storing computer usable program code embodied therewith, the computer usable program code comprising: computer usable program code to, when executed by a processor, determine a number of sub-samples in a number of original documents; and computer usable program code to, when executed by a processor, create a number of pseudo-documents from the sub-samples, the pseudo-documents comprising a portion of the number of sub-samples, in which each of the pseudo-documents are created by deleting a number of the sub-samples through a jackknife statistical method.
13. A computer program product for classifying documents, the computer program product comprising: a non-transitory computer readable medium storing computer usable program code embodied therewith, the computer usable program code comprising: computer usable program code to, when executed by a processor, determine a number of sub-samples in a number of original documents; and computer usable program code to, when executed by a processor, create a number of pseudo-documents from the sub-samples, the pseudo-documents comprising a portion of the number of sub-samples, in which each of the pseudo-documents are created by deleting a number of the sub-samples through a jackknife statistical method. 15. The computer program product of claim 13 , further comprising computer usable program code to, when executed by a processor, train a classifying device to classify textual documents based on the pseudo-documents.