getwd() #查看工作路徑 dir()#查看工作路徑中存儲(chǔ)的文件信息

文件--->更改工作路徑#更改工作路徑

（1）文本文檔文件的讀取：

read.table(file="數(shù)據(jù).數(shù)據(jù)類型",header=T,sep=””)

str()#瀏覽存儲(chǔ)類型和結(jié)構(gòu)信息

names()#查看數(shù)據(jù)框的各域名

head()#前六行

> str(A)

'data.frame': 104 obs. of 5 variables:

$ holderage : int 22 22 23 23 22 23 22 23 23 24 ...

$ vehiclegroup: Factor w/ 4 levels "A","B","C","D": 1 1 1 2 1 1 2 2

$ vehicleage : Factor w/ 3 levels "0-3","4-7","8-9": 1 2 3 1 2 3 1 2

$ claimamt : int 2312 2256 1064 3720 1992 2304 1890 2880

$ nclaims : int 8 8 4 10 28 1 9 5 1 3 ...

將讀入數(shù)據(jù)框的字符串由因子轉(zhuǎn)換成字符串read.table(file="車險(xiǎn)數(shù)據(jù).tex",header=T,sep=””,

stringsAsFactors=F)