- #421
arildno
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magpies said:In collecting literacy data, many countries estimate the number of literate people based on self-reported data. Some use educational attainment data as a proxy, but measures of school attendance or grade completion may differ. Because definitions and data collection methods vary across countries, literacy estimates should be used with caution.
There is no particular reason why there would be any clear-cut bias trend in the errors by those indicated sources of error you mention.
Thus, while the exact percentage rates are give&take figures, you'll have a hard time arguing that the TRUE relative ranking chart will differ very much from the one given above.