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Composite index
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Measuring Macroeconomic Performance Using a Composite Index
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Julian Gough, World Economics, September 2018
Large quantities of economic data, varying in accuracy and reliability and subject to later revision, are continually produced and published so interpretation using only one data source is subject to risk. The complex world of data can be simplified by combining different measures of economic performance—economic growth, unemployment and inflation into a single composite index. A composite index of cross-sectional data relating to the economic performance of all of the European Union in 2017 puts Ireland, Romania and Malta in the top three positions, while Germany is ranked 12th. Tracking the UK with the composite index using time-series data shows the impact of the financial crisis in 2008–09 with a gradual improvement in performance which peaks in 2015.
The Data Quality Index
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World Economics
World Economics, June 2017
GDP data is important used to apportion funds from international organisations, to influence rating agency decisions and much more, but official data is totally inadequate for the demands made of it. The notion of GDP data is flawed conceptually, but there are also severe methodological issues that need to be addressed prior to making international comparisons and assessing data reliability. World Economics has created an interactive Data Quality Index for users of economic data which considers five readily measurable factors that influence data reliability across countries. The Data Quality Index ranks 154 countries based on an equal weighting of the five factors, but users can adjust the importance of each to their data needs.
The Power of Price Indexes
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Raymond Cheung and Mike Waterson
World Economics, March 2011
Price indexes are the most important of all economic indicators simply because they are the tool used to calculate the real size, speed and direction of all forms of economic activity. Price indexes are compiled almost everywhere, but with major differences in method and sampling procedures. Some methods and procedures have led to significant errors. Even in the case of a country as advanced as Japan, critics have calculated that imperfections in method have led to a rate of price inflation around 1.8% per year above the level a true cost of living index would have shown. Further research undertaken by World Economics has attempted to make estimates for changes in discounting and promotional practices at the retail level. The conclusion is that, in reality, the overestimation of price changes by the Japanese CPI in recent years may well have been in excess of 2% per annum, and could have been significantly more. Different CPI assumptions change economic growth estimates dramatically. Using World Economics estimates, adding in a minimum figure for marketing and retail changes seen in recent years suggests, contrary to official data, that Japanese consumption growth exceeded that of the US.
What a Consumer Price Index Can’t Do
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Ralph Turvey, World Economics, September 2004
A monthly consumer price index traces changes in the monthly cost of a year’s consumption using a sample of prices. But in some months the prices that can be sampled will temporarily exclude some of the products that were bought in the base year, Christmas trees providing a textbook example. Worse still, it becomes permanently impossible to observe prices for sampled products that have been completely superseded. There are methods for dealing with these two problems, but they leave serious and irremediable defects in the index.
Some Proposed Methodological Developments for the UK Retail Prices Index
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Mick Silver, World Economics, March 2003
The Retail Prices Index (RPI) is one of the UK’s most important macroeconomic indicators, as well as being used for indexation/adjustments for inflation to wages and benefits. This paper argues that the dynamic changes in product markets and consumers’ responses to price changes need to be incorporated into the RPI if it is to effectively measure changes in the cost of living. The quite positive and innovative work undertaken by the Office for National Statistics (ONS) is acknowledged. However, the basis of the RPI, in measuring the price changes of a matched, fixed basket of goods, is considered inappropriate to modern markets. Some proposals are made.
Owner-occupiers and the Price Index
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Ralph Turvey, World Economics, September 2000
The treatment of owner-occupied dwellings in Consumer Price Indexes varies between countries and is the subject of continuing controversy. Ralph Turvey explains the alternative possible treatments and reasons for disagreement.



Displaying: 1-6 of 6