Question

我有一个数据集，如下所示

id        Description           Value       Date             Indicator
462269    Toyota                9.23        2013-10-21       Post
462269    Toyota                57.45       2013-07-11       None
462269    Ford                  32.95       2013-01-25       Pre
462269    Mazda                 12.29       2013-04-13       None
462269    Chevy                 11.24       2013-05-12       Pre
806284    Toyota                12.11       2014-05-15       Pre
806284    Mazda                 12.56       2014-04-16       Pre
806284    Hyundai               89.95       2014-09-15       Pre
806284    Chevy                 18.74       2014-02-19       Post
953303    Toyota                4.83        2012-08-14       Post
953303    Mazda                 95.46       2012-04-04       None
953303    Mazda                 12.78       2012-03-17       Pre

df = structure(list(id = structure(c(1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 
2L, 3L, 3L, 3L), .Label = c("462269", "806284", "953303"), class = "factor"), 
    Description = structure(c(5L, 5L, 2L, 4L, 1L, 5L, 4L, 3L, 
    1L, 5L, 4L, 4L), .Label = c("Chevy", "Ford", "Hyundai", "Mazda", 
    "Toyota"), class = "factor"), Value = structure(c(11L, 9L, 
    7L, 3L, 1L, 2L, 4L, 10L, 6L, 8L, 12L, 5L), .Label = c("11.24", 
    "12.11", "12.29", "12.56", "12.78", "18.74", "32.95", "4.83", 
    "57.45", "89.95", "9.23", "95.46"), class = "factor"), Date = structure(c(8L, 
    7L, 4L, 5L, 6L, 11L, 10L, 12L, 9L, 3L, 2L, 1L), .Label = c("2012-03-17", 
    "2012-04-04", "2012-08-14", "2013-01-25", "2013-04-13", "2013-05-12", 
    "2013-07-11", "2013-10-21", "2014-02-19", "2014-04-16", "2014-05-15", 
    "2014-09-15"), class = "factor"), Indicator = structure(c(2L, 
    1L, 3L, 1L, 3L, 3L, 3L, 3L, 2L, 2L, 1L, 3L), .Label = c("None", 
    "Post", "Pre"), class = "factor")), .Names = c("id", "Description", 
"Value", "Date", "Indicator"), row.names = c(NA, -12L), class = "data.frame")

我的目标是将此数据集转换为多级列表，其中ID是主要列表元素，Description是嵌套在每个ID和{{1}下的第二级别是第三级元素。所需的输出如下所示

Value, Date, Indicator

我想强调第三级元素（价值，日期，指标）

462269    

    Toyota
            Value       Date            Indicator
            9.23        2013-10-21      Post
            57.45       2013-07-11      None    
    Hyundai     
            Value       Date            Indicator
                NA      NA              NA
    Mazda            
            Value       Date            Indicator
            12.29       2013-04-13      None
    Chevy          
            Value       Date            Indicator
            11.24       2013-05-12      Pre
    Ford     
            Value       Date            Indicator
            32.95       2013-01-25      Pre

806284    

    Toyota
            Value       Date            Indicator
            12.11       2014-05-15      Pre 
    Hundai     
            Value       Date            Indicator
            89.95       2014-09-15      Pre
    Mazda            
            Value       Date            Indicator
            12.56       2014-04-16      Pre
    Chevy          
            Value       Date            Indicator
            18.74       2014-02-19      Post
        Ford     
            Value       Date            Indicator
            NA          NA              NA
953303    

    Toyota
            Value       Date            Indicator
            4.83        2012-08-14      Post
    Hundai     
            Value       Date            Indicator
            NA          NA              NA  
    Mazda            
            Value       Date            Indicator
            95.46       2012-04-04      None
            12.78       2012-03-17      Pre
    Chevy          
            Value       Date            Indicator
                NA      NA              NA
    Ford     
            Value       Date            Indicator
                NA      NA              NA

应采用矩阵格式。

非常感谢任何帮助实现这一目标。提前谢谢。

Answer 1

两次使用split将创建您想要的嵌套列表结构。

lapply(split(df, df$id),function(x) split(x,x$Description))

r将数据帧的元素转换为多级列表

1 个答案: