SContinuous2D-2-21 - Monday February 21, 2011 Last time:...

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Monday February 21, 2011 Last time: Lab 6: Categorical 2D Today: Continuous 2-D: Scatterplots, Trends Next Time: Review Announcements: Exam 1 Friday 2/25; Lab clusters Extra OH will be sent by email today Review Summary Rebecca Nugent, Department of Statistics, Carnegie Mellon University, 2011 1
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Continuous 2-Dim Structure: Examine variables individually: Examine variables together: What do we want to know? Measuring Linear Association: cor(x1,x2) When is this not useful? Scatterplot: two-dimensional plot of the two variables; can see grouping and type of relationship library(MASS);attach(birthwt) plot(age,bwt,pch=16,xlab="Years",ylab="Grams",main="Mother’s Age vs. Child’s Birthweight") ##to see different pchs plot(1:16,1:16,pch=1:16,cex=2); plot(1:16,1:16,col=1:16,cex=2,pch=16) Rebecca Nugent, Department of Statistics, Carnegie Mellon University, 2011 2
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Continuous Trends: can add a linear trend or a nonparametric smoother Linear Trend: Lowess Smoother:
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SContinuous2D-2-21 - Monday February 21, 2011 Last time:...

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