ECON 2B03 Lecture Notes - Lecture 2: Scatter Plot, Categorical Variable, Bar Chart
25 Apr 2016
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Economic 2b03 chapter 1& 2 (lecture 03 - 09/09/2014) Cross tabulations are tabular summaries for two variables one variable represented by row heads the other variable represented by column heads information for both variables entered in table cells. Suppose that 7 out of 10 males are admitted to an engineering school while 4 of 10 females are admitted. Cross tabulation is extremely useful in bivariate (two variables analysis). It can even be used to test independence, though we will not get to it sometime. Core graphs: two-dimensional graphs, examples: histograms scatter diagrams, etc. Specialty graphs: combine elements from core graphs to display data in unique ways, examples: bar graphs, pie charts, etc. 1: display data of 3 variables with height, width, and depths. Identifies upper and lower limits of data classes: vertical axis. Shows umber of observations in each class (absolute frequencies) Shows ratio of class frequency to class width (relative frequencies)
