当我保存对数据变量所做的更改时，将保存旧状态。哪里出错了？

Question

我的输入数据是：

X, occupation ,  focc   , education  ,  race
1, 1 , sales  , professional ,  14  ,    non-black
2, 2 , craftsmen , sales    ,   13   ,    non-black
3, 3  ,  sales  ,  professional 16    ,    non-black

我删除x列并保存，但未修改的状态被保存：

data <- read.csv("gss.csv")
data$X <- NULL
head(data)  
write.csv(data,file = "puregss.csv")

未修改状态已保存：

head(read.csv("puregss.csv"))

我期待这个输出：

occupation ,  focc   , education  ,  race
1 , sales  , professional ,  14  ,    non-black
2 , craftsmen , sales    ,   13   ,    non-black
3  ,  sales  ,  professional 16    ,    non-black

Answer 1

write.csv(data, "puregss.csv", row.names = FALSE)