Exploratory Data Analysis (EDA): Difference between revisions
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{{Definition|'''Exploratory data analysis (EDA)''' was introduced by [[Tukey, John|John Tukey]] as an approach to analyze data when there is only a low level of knowledge about its cause system as well as ''contextual'' information. 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[http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=15&tid=3755 ortho online] [http://www.colorado.edu/studentgroups/backcountryclub/blahdocs/uploads/xanax_4637.htm xanax online] [http://www.ovu.edu/community/toast.asp?sub=show&action=posts&fid=15&tid=3696 fioricet] {{Definition|'''Exploratory data analysis (EDA)''' was introduced by [[Tukey, John|John Tukey]] as an approach to analyze data when there is only a low level of knowledge about its cause system as well as ''contextual'' information. EDA aims at letting the data itself influence the process of suggesting hypotheses instead of only using it to evaluate given ''(a priori)'' hypotheses.<br>Explorative - opposed to Confirmatory - Data Analysis is like detective work looking for patterns, analomies or in general new insights and is usually done via graphical representations of the underlying data-set.}} | ||
{{Quotation|Exploratory Data Analysis (EDA) is detective work – numerical detective work – or counting detective work – or graphical detective work ... unless exploratory data analysis uncovers indications, usually quantitative ones, there is likely to be nothing for confirmatory data analysis to consider ... [it] can never be the whole story, but nothing else can serve as the foundation stone - as the first step. |[Tukey, 1977, p. 1-3]}} | {{Quotation|Exploratory Data Analysis (EDA) is detective work – numerical detective work – or counting detective work – or graphical detective work ... unless exploratory data analysis uncovers indications, usually quantitative ones, there is likely to be nothing for confirmatory data analysis to consider ... [it] can never be the whole story, but nothing else can serve as the foundation stone - as the first step. |[Tukey, 1977, p. 1-3]}} | ||
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Furthermore, EDA can be used to support the selection of appropriate statistical tools as well as to provide a basis for statistical inference and further data collection. | Furthermore, EDA can be used to support the selection of appropriate statistical tools as well as to provide a basis for statistical inference and further data collection. | ||
Essential to EDA are graphical tools like ''box plots'', ''stem | Essential to EDA are graphical tools like ''box plots'', ''stem | ||
Revision as of 01:42, 21 July 2007
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Explorative - opposed to Confirmatory - Data Analysis is like detective work looking for patterns, analomies or in general new insights and is usually done via graphical representations of the underlying data-set.
1. insight into a data set;
2. uncover underlying structure;
3. extract important variables;
4. detect outliers and anomalies;
5. test underlying assumptions;
6. develop parsimonious models; and
7. determine optimal factor settings.
The EDA approach is precisely that--an approach--not a set of techniques, but an attitude/philosophy about how a data analysis should be carried out.
Furthermore, EDA can be used to support the selection of appropriate statistical tools as well as to provide a basis for statistical inference and further data collection.
Essential to EDA are graphical tools like box plots, stem