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what is index number
uses of index
U.S. goes by Cetane Number of 40 whereas EU follows a Cetane Index of 46 plus a Cetane Number of 51. Other countries either specify Cetane Number or Cetane index, some of them specify both. Cetane Number can be improved by adding chemical additives , the Cetane Index cannot be influenced since its a quality of base fuel.
Its Postal Index Number and for mobile its Personal Identity Number.
disadvantages of index numbers
A Stock Market index option is a kind of option. In fact, it is a kind of financial derivative. It is often tied to either a narrow-based index or a broad-based index.
unit test in index
To determine index correction , we take sharp edged straight knitting needle.Measure its actual length using the metre rod.This actual length is called real distance( x ).Arranege the uprights containing the mirror and the needle on the optical bench.Adjust their heights so that centre of the mirror and tip of the needle lie on the same horizontal line i.e the two are at the same height.Adjust the distance between the uprights so that one end of knitting needle touches the knitting needle and the other end of the knitting needle touches the centre of the mirror.Read the positions of the index marks carrying the two uprights. The difference in these positions gives us the observed distance( y ).Index correction = Real distance - observed distance= x - yThis may be +ive or -ive.
The index in a stock exchange refers to the indicator of the overall performance of the exchange. Usually a number of large conglomerates that are listed in the exchange are chosen for the calculation of the Index. For Ex: The Sensex (Bombay Stock Exchange) comprise of 30 of the top companies in India. Each of these 30 companies has a weightage in the index and the price movement of these companies in either direction can influence the index.
Index numbers are usually expressed by setting some selected value as 100 and converting all other numbers to an index relative to that base.So, for a simple index, if the value y(0) is set to 100, then the index for the value y(k) is y(k)/y(0)*100.The calculations become more complicated if the index is for a collection of items. In such cases, a number of different "sub-indices" need to be combined together. The combined index is calculated as a weighted average of the component sub-indices, with the weights based on the importance of each su-index in the base period (base-weighted) or in the current period (current-weighted).
It is a database, either a manual card index or an electronic computer system.