learn from errors

函数调用报错

select：unused argument

1. click session -restart R                    （better）
2. replace select with dplyr::select

dat <- read_csv(ahi-cesd.csv)：Error in is.connection(x) : 找不到对象'ahi'

• dat <- read_csv("ahi-cesd.csv") #该函数引用文件名时要加引号
• 其他要加引号和不加引号的函数

c("id", "intervention")
filter(data, gender == "female")

select(all_dat, ahiTotal, cesdTotal, sex, age, educ, income, occasion, elapsed.days)

 

作图有误

if your graphs are looking weird this might be the reason

str(summarydata) #作图前观察数据类型

summarydata <- summarydata %>%
  mutate(sex = as.factor(sex),
         educ = as.factor(educ),
         income = as.factor(income)) #overwrite the data that is in the column sex with sex as a factor