Sixth Chapter Simple Graphics

6.1 Bar Charts 6.1.1 stacked bars and grouped bars

Library (VCD) library (GRID) counts<-table (arthritis$improved,arthritis$treatment) Countsbarplot (counts,         main= "Stacked Bar Plot",         xlab= "treatment", ylab= "Frequency", Col=c         ("Red", "yellow", "green"),         legend= Rownames (counts)) #legend provide labels

　　

Library (VCD) library (GRID) counts<-table (arthritis$improved,arthritis$treatment) Countsbarplot (counts,         main= "Stacked Bar Plot",         xlab= "treatment", ylab= "Frequency", Col=c         ("Red", "yellow", "green"),         legend= Rownames (counts), beside = TRUE) #beside indicates that each column in the matrix represents a grouping, and the values in the columns are tied instead of stacked

　　

6.1.2 Spine-like chart

Library (VCD) library (grid) attach (arthritis) counts<-table (treatment,improved) Countsspine (counts,         main= " Stacked Bar Plot ") Detach (arthritis)

　　

Sixth Chapter Simple Graphics