Knowing,How,Indexes,Are,Measur finance, share, loan Knowing How Indexes Are Measured
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An index is a statistical measure that represents the value of a batch of stocks. Investors use this measure like a barometer to track the overall progress of the market (or a segment of it). The oldest stock market index is the Dow Jones Industrial Average (DJIA or simply The Dow). In 1896, Charles Dow (of Dow Jones fame) created the Dow Jones Industrial Average; it covered only 12 stocks then (the number increased to 30 stocks in 1928, and it remains the same to this day). Because Dow worked long before the age of computers, he kept calculating a stock market index simple and did it arithmetically by hand. Dow added up the stock prices of the 12 companies and then divided the sum by 12.Technically, this number is an average and not an index (hence the word average in the name). For simplicity sake, well refer to it as an index. Nowadays, the number gets tweaked to also account for things such as stock splits. However, indexes get calculated differently. The primary difference between an index and an average is the concept of weighting. Weighting is the relative importance of the items when they are computed within the index.Several kinds of indexes exist, including:Price-weighted index - This kind of index tracks changes based on the change in the individual stocks price per share.To give you an example, suppose that you own two stocks - Stock A worth $20 per share and Stock B worth $40 per share. A price-weighted index allocates a greater proportion of the index to the stock at $40 than to the one at $20. Therefore, if we had only these two stocks in an index, the index number would reflect the $40 stock as being 67 percent (two-thirds of the number), while the $20 stock would be 33 percent (one-third of the number).Market-value weighted index - This kind of index tracks the proportion of a stock based on its market capitalization (or market value, also called market cap). Say that in your portfolio, you have 10 million shares of a $20 stock (Stock A) and 1 million shares of a $40 stock (Stock B). Stock As market cap is $200 million, while Stock Bs market cap is $40 million. Therefore, in a market-value weighted index, Stock A represents 83 percent of the indexs value because of its much larger market cap.Broad-based index - The sample portfolios in the preceding bullets show only two stocks obviously not a good representative index. Most investing professionals (especially money managers and mutual fund firms) use a broad-based index as a benchmark to compare their progress. A broad-based index has the purpose to provide a snapshot of the entire market, such as the S&P 500 or the Wilshire 5000. Composite index - This is an index or average that is a combination of several averages or indexes. An example is the New York Stock Exchange (NYSE) Composite, which tracks all the stocks on the NYSE. Checking Out the Indexes Although most people consider the Dow, Nasdaq, and Standard & Poors 500 to be the stars of the financial press, you may find other indexes equally important to follow because they cover other significant facets of the market, such as small-cap and mid-cap stocks.You can check out other less-sexy indexes that cover specific sectors and industries. If youre investing in an Internet stock, you should also check the Internet Stock Index to compare what your stock is doing when measured against the index. You can find indexes that cover industries such as transportation, brokerage firms, retailers, computer companies, and real estate firms. For a comprehensive list of indexes, go to www.djindexes.com (a Dow Jones & Co. Web site). The most reliable and most widely respected indexes are produced not only by Dow Jones but also Standard & Poors and the major exchanges/markets themselves such as the New York Stock Exchange (NYSE), the American Stock Exchange (AMEX), and Nasdaq. There are also indexes issued or provided by smaller exchanges (such as the Philadelphia Exchange).
Knowing,How,Indexes,Are,Measur