ECON 221 Lecture Notes - Lecture 2: Histogram, Ogive, Scatter Plot
1 Sep 2016
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Document Summary
Frequency distribution: groups data into categories and records how many observations fall into each category: use to summarize the number of items in non- overlapping classes. Relative frequency distribution: table summarizing the percent total observations in each non overlapping class: equation for class relative frequency: class frequency/total number. Pie chart: circle whose segments portray relative frequency of categories of some qualitative variable. Bar chart: depicts frequency for each category for qualitative data as horizontal or vertical bars. Frequency distribution: groups data into interval classes and records observations that go into each class: guidelines to follow: Cumulative frequency distribution: show how many observations fall below the upper limit of a particular class. Relative frequency distribution: shows fraction of values that fall into each class: class relative frequency equation: Histogram: representation of a frequency or relative frequency distribution: bar height = respective class frequency, bar width = class width. Shape of graphs are either symmetric or skewed.
