02 Visualizing Data - Visualizing Data Devore-Berk Chp 1...

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Unformatted text preview: Visualizing Data Devore-Berk Chp 1 Visualizing Quantitative Data, Tufte E. R., Graphics Press, 2001 Graphical Methods for Data Analysis , Chambers J., Cleveland, B. Kleiner, and P. Tukey, Duxbury Press, Boston, 1983 Exploratory Data Analysis , Tukey J., Addison-Wesley Pub Co., 1977 Observation and Perspective Tufte: Graphics reveal data. X1 Y1 X2 Y2 X3 Y3 X4 Y4 10.0 8.04 10.0 9.14 10.0 7.46 8.0 6.58 8.0 6.95 8.0 8.14 8.0 6.77 8.0 5.76 13.0 7.58 13.0 8.74 13.0 12.74 8.0 7.71 9.0 8.81 9.0 8.77 9.0 7.11 8.0 8.84 11.0 8.33 11.0 9.26 11.0 7.81 8.0 8.47 14.0 9.96 14.0 8.10 14.0 8.84 8.0 7.04 6.0 7.24 6.0 6.13 6.0 6.08 8.0 5.25 4.0 4.26 4.0 3.10 4.0 5.39 19.0 12.50 12.0 10.84 12.0 9.13 12.0 8.15 8.0 5.56 7.0 4.82 7.0 7.26 7.0 6.42 8.0 7.91 5.0 5.68 5.0 4.74 5.0 5.73 8.0 6.89 tufte$X1 5 10 15 20 5 10 15 tufte$X2 5 10 15 20 5 10 15 tufte$X3 5 10 15 20 5 10 15 tufte$X4 5 10 15 20 5 10 15 Tufte Script par(mfrow=c(2,2)) plot(tufte$X1,tufte$Y1, xlim=c(0,20),ylim=c(0,15),cex=1.5) plot(tufte$X2,tufte$Y2, xlim=c(0,20),ylim=c(0,15),cex=1.5) plot(tufte$X3,tufte$Y3, xlim=c(0,20),ylim=c(0,15),cex=1.5) plot(tufte$X4,tufte$Y4, xlim=c(0,20),ylim=c(0,15),cex=1.5) par(mfrow=c(1,1)) Communicate complex ideas with clarity, precision, and efficiency Tufte | Show the data | Substance rather than method | Avoid distortion | Present many numbers in a small space | Make large data sets coherent | Encourage eye to make comparisons | Reveal data at several levels | Purpose: z Description, exploration, tabulation, decoration | Closely integrated with statistical and verbal descriptions Napoleons Russian Campaign Minard (1885) Tufte (2001) http://www.math.yorku.ca/SCS/Gallery/re-minard.html Leaves data (histogram) 20 40 60 80 100 10 20 30 leaves hist(leaves) | N = 132 Median = 68 | Quartiles = 58, 79 | Decimal point is 1 place to the right of the colon | 2 : 7 | 3 : | 3 : 689 | 4 : 3 | 4 : 555688 | 5 : 00022223344 | 5 : 556777778888899 | 6 : 00001111122223344 | 6 : 5556667888888999 | 7 : 0011222233444 | 7 : 5555556666788899999 | 8 : 0000112222344 | 8 : 555567777999 | 9 : 01234 (stem & leaf) stem(leaves) Boxplot 40 60 80 boxplot(leaves) Exploratory Analysis Class Data Sex, Foot size (cm), Head Circumference (cm) Class Data Class Sex Foot Head 1 F 23 9.5 2 F 20 54.0 3 F 23 59.0 4 M 26 57.0 5 F 26 58.0 6 M 26 56.0 ....
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02 Visualizing Data - Visualizing Data Devore-Berk Chp 1...

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