Abstract
We are confronted with data every day, constantly. Daily newspapers contain information on stock prices, economic figures, quarterly business reports on earnings and revenues and much more. These data offer observed values of given quantities. The basic data types can be qualitative, ordinal, or quantitative. Keywords: qualitative data; quantitative data; ordinal data; univariate data; nominally scaled data; ordinally scaled data; interval scale; ratio scale; absolute data; cross-sectional data; time series data; frequency distributions; Freedman-Diaconis rule; inner quartile range (IQR); empirical cumulative relative frequency distribution
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