Market shares of several companies

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The following table compares market shares of several companies in the computer industry as reported by Gartner, an industry monitor. The table gives the number of computer systems shipped during each quarter, in thousands.

Company	4th Quarter, 2010	4th Quarter, 2011
HP	17,554,181	14,712,266
Lenovo	10,516,772	12,931,136
Dell	10,796,317	11,633,880
Acer	12,043,606	9,823,214
Asus	5,180,913	6,243,118
Other	37,358,786	36,827,666

(a) Summarize these data using both a stacked bar chart (of market share) and a mosaic plot. What message do these plots convey about the changes in market share from 2010 to 2011?

(b) Explain the differences between the two charts. One plot shows a feature of the data that the other does not show. What is it, and why is the difference subtle in this example?

Reference no: EM131009295

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