在 R 中重塑数据框

Posted 2023-02-14

【中文标题】在 R 中重塑数据框

【英文标题】：Reshaping an data frame in R

【发布时间】：2015-12-10 01:48:10

【问题描述】：

我在 R 中有这个长格式的数据框，看起来像这样..

Branch.Name Customer.ID Loan.Type Date      Stage       Time
           A    C001    Home      20/11/05  Processing  10
           A    C001    Home      20/11/05  Approval    30
           A    C001    Home      20/11/05  Finalize    5
           A    C002    Business  23/11/05  Processing  30

我想把它转换成宽格式..

Branch.Name Customer.ID Loan.Type   Date     Processing Approval    Finalize
A           C001        Home        20/11/05    10        30        5
B           C002        Business    20/11/05    30        10        0
B           C003        Business    20/11/05    12        15        0

我看着重塑和融化，但我得到了混乱的答案......

提前致谢

P.S：并非所有行都有“Processing”、“Approval”和“Finalize”作为阶段，有些可能有额外的阶段

【问题讨论】：

我认为您输入数据中的Branch.Name 应该有B'. Perhaps library(reshape2);dcast(df1, ...~Stage, value.var='Time', fill=0) `

【参考方案1】：

这是一个基本的从长到宽的转换。

尝试以下方法之一：

## Base R
reshape(mydf, direction = "wide", 
        idvar = c("Branch.Name", "Customer.ID", "Loan.Type", "Date"), 
        timevar = "Stage")

## reshape2
library(reshape2)
dcast(mydf, Branch.Name + Customer.ID + Loan.Type + Date ~ Stage, value.var = "Time")
## dcast(mydf, ... ~ Stage, value.var = "Time")

## tidyr
library(tidyr)
spread(mydf, Stage, Time)