COM 381 Lecture Notes - Lecture 13: Frequency Distribution, Summary Statistics, Squared Deviations From The Mean
21 May 2020
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Descriptive data analysis: provide summary information about the data collected, primary methods of describing the data. Describing data that is nominal in nature - categories, numbers: frequency tables. How frequent does a category occur in dataset. How many cases fall in a category. Used most often to describe the distribution of scores for the categories of a variable measured by a nominal scale. Percentage pertains to overall total of people surveyed/observed: bar graphs. Consists of plots used to show frequency counts. Frequency or percentage is shown along vertical axis. Horizontal axis displays values/categories of nominal variables. Key or legend at top: pie charts. Consist of circles which are divided into segments and are proportioned to the percentage of the circle that represents the frequency count for that category: line graphs. A single point represents the frequency or percentage for each category of the nominal variable. Summary statistics: measures of central tendency.
