On the website OECD there is a volume (Understanding Economic Statistics: an OECD perspective) that introduces the main concepts used by statisticians and economists to detect, measure and describe the economic phenomena. The book describes which are the sources of data available on the internet and contains an overview of key economic statistics produced by OECD. The last chapter is dedicated to quality (as you recognize?) statistical data. The author is Enrico Giovannini , Chief Statistician and Director of the Directorate of Statistic OECD. The reading is strongly suggested for those who use statistical data (and not just cheap!) for articles, publications, blog (journalists, authors, politicians ...) but also to all those who want to learn more!
