我的data.frame
包含数字值(Rate
),日期(TrdDate
) - 格式为1990-01-29
。我创建了一个与每个日期的工作日相匹配的列,我想计算每天的平均值。
TrdDate Rate weekday
1. 1990-02-20 120 monday
2. 1990-03-20 100 monday
3. 1990-04-21 100 Tuesday
4. 1990-05-01 100 Thursday
5. 1991-01-01 150 Thursday
所需的输出是:
weekday Rate
Monday 110
Tuesday 100
Thursday 125
答案 0 :(得分:1)
DF <- read.table(text="TrdDate Rate weekday
1990-02-20 120 monday
1990-03-20 100 monday
1990-04-21 100 Tuesday
1990-05-01 100 Thursday
1991-01-01 150 Thursday",strin=T,h=T)
aggregate(Rate ~ weekday ,DF,mean)
# weekday Rate
# 1 monday 110
# 2 Thursday 125
# 3 Tuesday 100
答案 1 :(得分:0)
如果您的数据框为df
,则可以
library(dplyr)
group_by(df, weekday) %>%
summarise(Rate = mean(Rate))