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Chapter 4 Exploratory Data Analysis

Chapter 4 Exploratory data AnalysisA first look at the mentioned in Chapter 1, Exploratory data Analysis or EDA is a criticalfirst step in analyzing the data from an experiment. Here are the main reasons weuse EDA: detection of mistakes checking of assumptions preliminary selection of appropriate models determining relationships among the explanatory variables, and assessing the direction and rough size of relationships between explanatoryand outcome speaking, any method of looking at data that does not include formalstatistical modeling and inference falls under the term Exploratory data Typical data format and the types of EDAThe data from an experiment are generally collected into a rectangular array ( ,spreadsheet or database), most commonly with one row per experimental subject6162 Chapter 4. Exploratory data ANALYSISand one column for each subject identifier, outcome variable , and explanatoryvariable.

4.2.1 Categorical data The characteristics of interest for a categorical variable are simply the range of values and the frequency (or relative frequency) of occurrence for each value. (For ordinal variables it is sometimes appropriate to treat them as quantitative vari-ables using the techniques in the second part of this section.) Therefore ...

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