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lecturetwo

# lecturetwo - Lecture#2 240A-1 Exploratory Data Analysis and...

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September 28, 2010 Lecture #2 240A- 1 L. Phillips Exploratory Data Analysis and JMP I. Open the JMP program by going to Start, Programs, Statistics, JMP 5.0.1 (select). II. Open the data file students by clicking on the open data table button in the JMP starter window and scrolling over to the file students.jmp in the folder Sample Data. The five columns contain the five variables: Age: an ordinal variable Sex: a nominal or categorical variable Height: a cardinal or numeric variable Weight: a cardinal or numeric variable: Idnum: id number, a nominal variable Note: there are 233 observations or rows III. To display ordinal and nominal variables, from the menu bar choose analyze/distributions In the distribution dialog box, select the variables age and sex and drag to the y, columns window. Hit the OK button. You can see there are more boys than girls and more twelve year olds than other ages. The graph on the left for the variable age is a histogram , plotting the frequency or number of observations for each age category. The graph on its right is a mosaic bar chart , showing the fraction of observations in each category. By hitting the red triangle button to the left of the word age, and choosing histogram options, you can add a count axis to the histogram.

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