STAT151 Lecture 3: STAT 151 Section 3, G. Wagner, LEC W1

• School: University of Alberta
• Department: Statistics
• Course: STAT151
• Professor: Sean Graves

Document Summary

Section 3 / chapter 2 in textbook - descriptive statistics: categorical data. Grouping qualitative data: need to group the data before it is possible to analyze it. Frequency (fi) - number of times a value of a variable occurs. Frequency distribution - a listing of all values for a variable and their frequencies. Shows how one variable is contingent on the other: segmented bar graph - stacked bars. Similar to multiple bar graph: multiple bar graph. Joint distributions - values in the body of a graph. Measured as %: frequency of joint event / grand total x 100, marginal distributions - total values for a variable (shown in bottom/right margins of graph). Measured as %: total frequencies of category / grand total x 100, conditional distribution - frequency distribution for one category of a variable at a time. Can be vertical or horizontal: frequency of specific category / total for variable x 100.