Summary measures or summary statistics or descriptive statistics are used to summarize a set of observations, in order to communicate the largest amount of information as simply as possible. Statistics which is a science of collection, analysis, presentation, and interpretation of the data, have two main branches, are descriptive statistics and inferential statistics. In place of individual case presentation, we present summary statistics of our data set with or without analytical form which can be easily absorbable for the audience. Usually, it is meaningless to present such data individually because that will not produce any important conclusions. A data set is a collection of the data of individual cases or subjects.
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