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SnowfallRegression_f10 - Statistics 3011 Course Notes...

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Statistics 3011, Course Notes Supplement 8 December 13, 2010 Regression of Late Season Snowfall on Early Season Snowfall In this handout, we will study a regression of late-season snowfall on early-season snowfall using data from Fort Collins, CO. In this example, it is natural to think of late-season snow- fall as the response variable and early-season snowfall as the explanatory variable. We want to use early-season snowfall to predict late-season snowfall, while the reverse makes no sense. It is always a good idea to plot the data, so we use R to draw a scatterplot. > loc<-"http://www.stat.umn.edu/~crolling/data/ftcollinssnow.txt" > snow<-read.table(loc,header=T) > attach(snow) > plot(x=Early,y=Late,xlab="Sept-Dec Snowfall (in.)", + ylab="Jan-June Snowfall (in.)", + main="Late vs. Early Season Snowfall in Ft. Collins, CO") > myfit<-lm(Late~Early) #Create the regression line and call it myfit 0 10 20 30 40 50 10 20 30 40 50 60 Late vs. Early Season Snowfall in Ft. Collins, CO Sept-Dec Snowfall (in.) Jan-June Snowfall (in.) Thoughts?
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