This document discusses using ggplot2 in R to create graphs and compares it to creating graphs in Excel. It provides an example of using ggplot2 to create a ribbon plot showing the variation of yearly water levels of Lake Huron from 1875 to 1972. The ribbon plot shows the area between one unit above and below the recorded water levels, represented as a ribbon, with the actual levels overlaid as a line. This allows ggplot2 to easily show the variation in levels compared to doing the same type of plot in Excel. The document encourages learning and using ggplot2 as it provides more flexibility and easier customization of plots compared to Excel.

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10. LakeHuron
ggplot2 geom_ribbon
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> huron <- data.frame(year = 1875:1972, level =
as.vector(LakeHuron))
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> h <- ggplot(huron, aes(x=year))
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> h + geom_ribbon(aes(ymin=level-1, ymax=level+1)) +
geom_line(aes(y=level))

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> h + geom_ribbon(aes(ymin=level-1, ymax=level+1)) +
geom_line(aes(y=level))

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