
Concept explainers
Facebook Wall Posts (Example 2) A student shared data from the StatCrunch Friend Data Application. Data on gender and number of wall posts for a sample of friends are shown below. (Source: StatCrunch, Facebook Friend Data, posted 2/13/14)
a. Is the format of this data set stacked or unstacked?
b. Explain the coding. What do 1 and 0 represent?
c. If you answered “stacked” in part a, then unstack the data into two columns labeled Male and Female. If you answered “unstacked,” then stack the data into one column and choose a appropriate name for the stacked variable.

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