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数据： > library(vcd) > head(Arthritis) ID Treatment Sex Age Improved 1 57 Treated Male 27 Some 2 46 Treated Male 29 None 3 77 Treated Male 30 None 4 17 Treated Male 32 Marked 5 36 Treated Male 46 Marked 6 23 Treated Male 58 Marked > 1. 生成频数表 1.1 一维列联表 > mytable <- with(Arthritis, table(Improved))
> mytable
Improved
None Some Marked
42 14 28
> prop.table(mytable)
Improved
None Some Marked
0.5000000 0.1666667 0.3333333
> prop.table(mytable)*100
Improved
None Some Marked
50.00000 16.66667 33.33333
>
1.2 二维列联表
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