POL232H1 Lecture Notes - Lecture 2: Telephone Numbers In The United Kingdom
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The first half of the semester is on descriptive statistics. When we describe the variable of our interest, we want to know. Distribution of variable: how the values of a variable are distributed across observations. Center of distribution: value of a variable of a typical observation in the data. How the values of a variable spread from the center. Distribution of the number of observations (frequency) or the proportion/percentage of observations ( relative frequency ) across different values of a variable. With 101 distinct values taken by this variable, it would not be informative to describe the (relative) frequency of each value. More informative to describe the relative frequency of the range of values. Can do bar graph with intervals of ten histogram. Y-axis can be number of observation or proportion or percentage. To describe the central tendency, we may use the following three summary statistics (= numerical summaries of data)
