Indexing as a Method for Data Analysis
Metal prices continued to soar in early 2006 as illustrated in Figure 11.1, which gives the index value for various metals for the first half of 2006 based on an index of 100 at the beginning of the year. The price of silver has risen by some 65%, gold by 32%, and platinum by 21%. Aluminium, copper, lead, nickel, and zinc are included in The Economist metals index curve and here the price of copper has increased by 60% and nickel by 45%.1 Indexing is another way to present statistical data and this is the subject of this chapter.
After studying ...