MGMT 4B Lecture Notes - Lecture 3: Pie Chart, Categorical Variable, Frequency Distribution

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Categorical data (labels, names, anything to identify categories) Frequency distribution o o o o o o o o o. A tabular summary of data showing the number (frequency) of observations in each of several non-overlapping categories or classes. Objective: to provide insights about that data that cannot be quickly obtained by looking at the original data. Relative frequency - the fraction or proportion of the total number of data items belonging to class. Relative frequency distribution - a tabular summary of a set of data showing the relative frequency for each class. Single data divided by total = relative frequency. Pareto diagram - when bar charts are arranged descending order. Relative frequency x 360 = degrees of circle. Determine the width of each class (largest data value - smallest data value) / # of class. Sample of 120 responses provides 60 a, 24 b, and 36 c.

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