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Home > Statistics > Outline of Statistics and Statistical Release Schedule > Notices of Changes and Corrections 2011 > Regular examination of the statistical accuracy of the Tankan
February 18, 2011
Bank of Japan
The Bank of Japan examine the statistical accuracy of the Tankan (Short-Term Economic Survey of Enterprises in Japan) once a year, to prevent a decline in the statistical accuracy due to a decrease in the number of sample enterprises caused by bankruptcies, mergers, and other factors. We add new sample enterprises to the Tankan when the examination shows that statistical accuracy has declined. The result of the recent examination showed that the statistical accuracy of the latest survey (December 2010) met the standard. As a result, the total number of the sample enterprises for the March 2011 survey will be 11,302 (including 201 financial institutions).
Details of the examination are as follows.
Population enterprises are classified into 397 strata by industry, scale based on capital size, and number of regular employees to calculate the population estimate.
For each stratum subject to the sample design,1 we examined whether the distribution of the sample enterprises properly reflected that of the population enterprises. The result showed that there was no stratum in which the distribution of the sample had deviated from that of the population.2
For all of the six main categories (manufacturing and nonmanufacturing for large, medium-sized, and small enterprises, see below), the error ratios of the population estimates3 (measured by sales data) remained within the target range (3 percent for manufacturing and 5 percent for nonmanufacturing).
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