It is common for people to track broad-based Indian stock market indices like the Nifty & Sensex. However, there’s more to it than just that. In reality, many indices that comprise different sectors don’t always move in tandem. They may have a correlation, but it is important to understand which sectors moved and by how much if you want to have a good grip on your portfolio of stocks. This is especially useful if you have a top-down approach to trading. Of course, almost all trading is top-down but nevertheless, worth a mention.