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It is an objective of classification
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Simplification, comparability
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Classification of data on the basis of time period
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Chronological classification
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Character of a fact, can be measured in form of number
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Variable
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A series in which class interval excludes the items corresponding to the upper limit
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Exclusive series
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Number of times an item occurs
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Frequency
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Difference between the upper limit and the lower limit
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Magnitude of class interval
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A series of statistical data with two variables
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Bivariate frequency distribution
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Average value of upper limit and lower limit
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Mid value
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Lower limit of the first class interval is missing
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Open end series
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Classification of data on the basis of locational differences
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Spatial classification
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