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Data rarely comes in usable form. Data wrangling and exploratory data analysis are the difference between a good data science model and garbage in, garbage out.
Samuel Leinhardt, Stanley S. Wasserman, Exploratory Data Analysis: An Introduction to Selected Methods, Sociological Methodology, Vol. 10 (1979), pp. 311-365 ...
Multivariate Exploratory Analysis of Ordinal Data in Ecology: Pitfalls, Problems and Solutions, Journal of Vegetation Science, Vol. 16, No. 5 (Oct., 2005), pp. 497-510 ...