Supplement_1

Supplement_1 - DATA DISPLAY DATA DISPLAY Documents prepared...

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≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈ DATA DISPLAY ≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈ DATA DISPLAY Documents prepared for use in course C22.0103.001 , New York University, Stern School of Business Types of data page 3 “Data” is a catchall term. But data comes in a number of varieties, and it’s important to distinguish among these varieties. The Pareto chart page 7 The Pareto chart is a simple but flashy presentation method for categorical data. The dot diagram page 9 The dot diagram is a primitive display device for quantitative data. It can only be used for relatively small numbers of data points. The stem-and-leaf display page 10 This simple display for quantitative data can be constructed by hand. It’s an approximation to a histogram (bar chart), and it facilitates the hand calculation of the median and the quartiles. It gives a quick visual impression of the data while still providing considerable detail. The boxplot page 16 This graphical device for quantitative data is especially effective for comparing two or more groups. The boxplot utilizes the median and the quartiles. Boxplot pathologies page 20 Boxplots can sometimes look weird. Here are some examples, along with the reasons why they happen. Gary Simon, 2005 Revis ed by Avi Giloni on September 1, 2005 1
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≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈ DATA DISPLAY ≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈ 2
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5555555555 DATA TYPES 6666666666 A number of distinctions are made with regard to data. These are easy to understand through examples. Univariate or multivariate ? Univariate information consists of one fact for each object in the data base. The listing of the rates of returns for each of 500 mutual funds is univariate information. Multivariate information consists of two or more facts for each object in the data base. The listing of (rates of return, load fees, management overhead) for each of 500 mutual funds is multivariate information. Multivariate information may of course be reduced to univariate information. For example, you could deal with rates of return (only) even though you also have other information. Univariate information is sometimes called scalar , and multivariate information is sometimes called vector . Qualitative or quantitative ? Quantitative information is presented as numbers permitting arithmetic. Qualitative information is everything else. This sounds easy, but watch out for non-numeric information tagged with numbers. For example, consider a set of responses about laundry detergents: 1 = Tide 2 = Surf 3 = Wisk 4 = Cheer (etc) This information is qualitative, and the numbers are mere labels of convenience. In particular, you cannot do arithmetic.
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This note was uploaded on 05/24/2008 for the course ACC 203 taught by Professor Choi during the Spring '08 term at NYU.

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Supplement_1 - DATA DISPLAY DATA DISPLAY Documents prepared...

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