Question

我有两个数据框。数据帧“天气”看起来像这样：

weather<-data.frame(Date=c("2012-04-01","2012-04-02","2012-04-03","2012-04-04"),Day=c("Sunday","Monday","Tuesday","Wednesday"), Temp=c(86,89,81,80))

Date       Day       Temp    
2012-04-01 Sunday     86
2012-04-02 Monday     89
2012-04-03 Tuesday    81
2012-04-04 Wednesday  80

而且，dataframe“Regularity”，如下所示：

Regularity<-data.frame(Date=c("2012-04-02","2012-04-04","2012-04-03","2012-04-04"),EmployeeID=c(1,1,2,2),Attendance=c(1,1,1,1))

Date        EmployeeID Attendance
2012-04-02           1          1
2012-04-04           1          1
2012-04-03           2          1
2012-04-04           2          1

我想在R中创建一个面板数据框：

Date       Day       Temperature EmployeeID Attendence  
2012-04-01 Sunday     86              1         0
2012-04-02 Monday     89              1         1
2012-04-03 Tuesday    81              1         0
2012-04-04 Wednesday  80              1         1
2012-04-01 Sunday     86              2         0
2012-04-02 Monday     89              2         0
2012-04-03 Tuesday    81              2         1
2012-04-04 Wednesday  80              2         1

我尝试过合并和reshape2，但是徒劳无功。我将非常感谢任何帮助。谢谢。

Answer 1

您可以使用双merge和expand.grid，如下所示：

merge(weather, 
      merge(Regularity, 
            expand.grid(Date = unique(weather$Date), 
                        EmployeeID = unique(Regularity$EmployeeID)), 
            all = TRUE))
#         Date       Day Temp EmployeeID Attendance
# 1 2012-04-01    Sunday   86          1         NA
# 2 2012-04-01    Sunday   86          2         NA
# 3 2012-04-02    Monday   89          1          1
# 4 2012-04-02    Monday   89          2         NA
# 5 2012-04-03   Tuesday   81          1         NA
# 6 2012-04-03   Tuesday   81          2          1
# 7 2012-04-04 Wednesday   80          1          1
# 8 2012-04-04 Wednesday   80          2          1

expand.grid步骤是获取＆＃34;日期＆＃34;的所有组合。和＆＃34;员工ID＆＃34;这是完整数据集所必需的。

您可以使用＆＃34; 0＆＃34;轻松替换NA值在另一个步骤。

如何创建/合并面板数据？

1 个答案: