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However , as the index grows in size the compression factor of the TIO may not achieve the same efficiency as the centroids . The index is based on objective data - per capita income ( in purchasing power parity terms ) , education ( literacy rate , gross enrollment ratio ) and health ( life expectancy ) and has evolved over time . The " key votes " on which the index is based are not identified by Adams , but he nowhere indicates that the index provides a measure of ideological extremism . Instructions for adding an index to a DocBook XML document has been added , along with a brief explanation on how the index is auto-generated . The Index is broken down into : national dailies national Sundays regional dailies by country , county and town weekly local newspapers by country , county and town . The index is based on several factors , including the speed at which these sectors are moving into electronic commerce and Web-based customer service activities and the level of privacy planning and protection that has been put into place by organizations within the sectors . The index contains links to color maps used in the assessment . For a given year and country , the index is based on the disposable average output of each commodity in terms of weight or volume during the period of interest multiplied by the 1989-91 average national producer price per unit . The index contains links to each article of the agreement . The index is based on the assumption that the productivity of the faculty is a prime indication of the quality of a program . The index contains links to the appropriate Executive order table .