POL242Y5 Study Guide - Midterm Guide: Percentile Rank, Univariate, Quartile
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Univariate analysis begins by describing three characteristics of each variable under study; Dispersion how much do the values spread out. A frequency distribution: shows the number of cases in each category of the variable. Displays the frequency with which each possible Whenever you hear percentages you should think percent of what (assignment) Measure of central tendency: most typical value; the one value that best represents the entire distribution. Something that uses the same units for example, age. Median = middle value: half cases above and half below. Cannot do nominal because no top or bottom so no middle. Can do it with any kind of variables. Sum the values in frequency distribution and divide by the number of cases. Line them all up and choose the middle one. Central tendency: the median is the value taken by the middle. When an interval-level variable has extreme values, the median should be reported as well.
