Fundamentals of Statistics contains material of various lectures and courses of H. Lohninger on statistics, data analysis and chemometrics......click here for more. 
Home Basic Concepts Definition of basic terms Exploratory Data Analysis  
See also: Hypothesis Testing  
Exploratory Data AnalysisExploratory data analysis (EDA) can be seen in contrast to traditional hypothesis testing. While the testing of hypotheses always requires an a priori assumption (or hypothesis) about the data (e.g. "There is a difference in the life expectation between smokers and nonsmokers"), exploratory data analysis is not based on any a priori assumptions. Any method can be used to identify systematic relations between the variables. In a typical exploratory data analysis all variables are taken into account using both graphical (e.g. scatter plots) and formal methods (e.g. principal component analysis) to search for systematic patterns. 

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