library(dplyr)
data("PlantGrowth")
view(PlantGrowth)
给数据集新加一列 weight_cat ,并用 case_when
自定义名称
PG = PlantGrowth |>
mutate(weight_cat = case_when(
weight <= 4.5 ~ "light",
weight > 4.5 & weight <= 5.5 ~ "medium",
weight > 5.5 ~ "heavy"
)
)
view(PG)
统计 group 和 weight_cat 的次数
table(PG$group, PG$weight_cat)
table_count1 = table(PG$group,PG$weight_cat)
view(table_count1)
addmargins(table_count1, 1) # 在最后一行加
addmargins(table_count1, 2) # 在最后一列加
addmargins(table_count1) # 在最后一行和最后一列都加
即每行加起来为100%,但每列加起来不一定是100%
# row percentage table
table_count2 = addmargins(table_count1, 1)
table_count2
prop
ortion 比例
prop.table(x,1
) 按行
计算百分比
prop.table(x,2
) 按列
计算百分比
最后一列加sum
table_count3 = addmargins(table_count2,2)
table_count3
table_per2 = addmargins(table_per1,2)
table_per2
可以看到每行 sum
都是100
如果直接把 count
和 percentage
拼接起来,结果有点奇怪,可以根据需求自定义修改
paste0(table_count3, "(", round(table_per2), "%)")
先用round
去掉了小数点,再把百分比数值前边加上(
,再把百分比数值右边加上%
和)
matrix(paste0(table_count3, "(", round(table_per2), "%)"),dim(table_count3))
将输出变成矩阵的形式,可以指定输出的 shape,用dimention
来指定shape更方便
数据有了,我们还缺少行名和列名,下面介绍一个快捷方式
先看例子
dimnames(table_count3)
先输出行名,在输出列名
加到我们需要的表格上
matrix(paste0(table_count3, "(", round(table_per2), "%)"),dim(table_count3),dimnames = dimnames(table_count3))
以上,我们就得到了需要的表格,现在将最后一条代码规整化并命名新的表名
tab_combine = matrix(paste0(table_count3, "(", round(table_per2), "%)"),
dim(table_count3),
dimnames = dimnames(table_count3)
)
完整代码
library(dplyr)
data("PlantGrowth")
view(PlantGrowth)
PG = PlantGrowth |>
mutate(weight_cat = case_when(
weight <= 4.5 ~ "light",
weight > 4.5 & weight <= 5.5 ~ "medium",
weight > 5.5 ~ "heavy"
)
)
view(PG)
table_count1 = table(PG$group,PG$weight_cat)
table_count2 = addmargins(table_count1, 1)
table_per1 = prop.table(table_count2,1)*100
table_count3 = addmargins(table_count2,2)
table_per2 = addmargins(table_per1,2)
tab_combine = matrix(paste0(table_count3, "(", round(table_per2), "%)"),
dim(table_count3),
dimnames = dimnames(table_count3)
)
tab_1 = table(PG$group,PG$weight_cat)
tab_2 = addmargins(tab_1,2)
tab_3 = addmargins(tab_2,1)
tab_per1 = prop.table(tab_2,2)*100
tab_per2 = addmargins(tab_per1,1)
tab_colmn_combine = matrix(paste0(tab_3, "(", round(tab_per2), "%)"),
dim(tab_3),
dimnames = dimnames(tab_3)
)
tab_colmn_combine
tab_1 = table(PG$group,PG$weight_cat)
tab_2 = addmargins(tab_1)
tab_per1 = prop.table(tab_1)*100
tab_per2 = addmargins(tab_per1)
tab_colmn_combine = matrix(paste0(tab_2, "(", round(tab_per2), "%)"),
dim(tab_2),
dimnames = dimnames(tab_2)
)
tab_colmn_combine