gilgold2 - It seems Yahoo has "spaced" your explanation to me of how you are calculating this ALONG WITH my response, which was:
That's very interesting. Have you backtested it and found that it accurately predicts what the actual short interest will be from the previous settlement to the next settlement date? I have seen that site before but I was not clear on whether or not the daily short volume that they give is the short positions initiated during that day MINUS the sum of the portion of those same positions that were also covered during that same day and the old short positions that were covered that day.