20. The method of claim 12 , further comprises: receiving, by the computer, a sentiment time decay factor for publications, wherein the sentiment time decay factor reflects a limited timeframe of influence of publications on the extrinsic metric relative to the publication dates for the publications; finding, by the computer, an age sentiment score for the on temporaneous publication by applying the sentiment time decay factor to the sentiment score for age relative to the contemporaneous publication date; finding, by the computer, a second age sentiment score for a second contemporaneous publication by applying the sentiment time decay factor to the second sentiment score for age relative to the second contemporaneous publication date; and sentiment ranking, by the computer, the contemporaneous publication and the second contemporaneous publication based on their respective age sentiment score and second age sentiment score.
20. The method of claim 12 , further comprises: receiving, by the computer, a sentiment time decay factor for publications, wherein the sentiment time decay factor reflects a limited timeframe of influence of publications on the extrinsic metric relative to the publication dates for the publications; finding, by the computer, an age sentiment score for the on temporaneous publication by applying the sentiment time decay factor to the sentiment score for age relative to the contemporaneous publication date; finding, by the computer, a second age sentiment score for a second contemporaneous publication by applying the sentiment time decay factor to the second sentiment score for age relative to the second contemporaneous publication date; and sentiment ranking, by the computer, the contemporaneous publication and the second contemporaneous publication based on their respective age sentiment score and second age sentiment score. 23. The method of claim 20 , wherein defining the region of sentimental significance in the document sentiment vector space further comprises: creating an action document vector for each document vector from the documents-by-concepts matrix representing a sentimentally significant document.