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Unformatted text preview: 1 Frequency Distribution Dataset is summarized in a tabular form. Range of the dataset is partitioned into a number of classes of equal width. Frequency distribution table is constructed by counting number of observations (called frequency) in each class and presenting the classes and their frequencies in a tabular form. 2 Guidelines Guidelines for selecting number of classes: Use between 5 and 20 classes. Larger datasets require a larger number of classes. Smaller data sets usually require fewer classes Guidelines for deciding classwidth: Use classes of equal width. Adjacent Class Width 3 Histogram A common graphical presentation of frequency distribution is a HISTOGRAM. The variable is placed on the horizontal axis and the (relative) / frequency is placed on the vertical axis. A rectangle is drawn above each class interval with its height proportional to the frequency of that class....
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 Fall '10
 Balaji
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