[英]How to get the results of a mean and standard deviation to the same data frame by creating extra columns (mean and standard deviation) in R
[英]How I should get mean and standard deviation depens on "Day" and "Category" columns without filtering manually in the R code
我在過濾 R 控制台中的以下列時得到平均值和標准偏差,但是如果不過濾列“日”和“類別”而不在代碼中手動過濾,我應該如何獲得平均值和標准差,結果應該打印在同一個 CSV 本身。
代碼應自動創建依賴列過濾器,如下所示,並在相同的 CSV 中打印結果:
mean_Day1_Category_a, SD_Day1_Category_a,
mean_Day4_Category_b, SD_Day4_Category_b, etc...
數據
Sex F_category Value Day category
M Food 25.6 1 a
M Water 22 2 a
M Food 22 11 a
M Food 24.3 4 b
M Food 24 5 b
F Water 2.03 10 b
代碼
library(dplyr)
library(plyr)
library(doBy)
data <- read.csv("C:/Users/food.csv")
print(data)
data_male<- data %>%
filter(sex == "M")%>%
filter(Day == 1)%>%
filter(F_Category =="FC")%>%
filter(Category =="a")
data_male
sd(data_male$value)
mean(data_male$value)
您必須按日期和類別對數據進行分組,而不是過濾。
data_male %>% group_by(Day, Category) %>% summarise(avg_val = mean(Value), std_val = std(Value))
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