我有这个示例数据集，我想将其转换为以下格式：
Type <- c("AGE", "AGE", "REGION", "REGION", "REGION", "DRIVERS", "DRIVERS")
Level <- c("18-25", "26-70", "London", "Southampton", "Newcastle", "1", "2")
Estimate <- c(1.5,1,2,3,1,2,2.5)
df_before <- data.frame(Type, Level, Estimate)
Type Level Estimate
1 AGE 18-25 1.5
2 AGE 26-70 1.0
3 REGION London 2.0
4 REGION Southampton 3.0
5 REGION Newcastle 1.0
6 DRIVERS 1 2.0
7 DRIVERS 2 2.5
基本上，我想将数据集转换为以下格式。我已经尝试过该功能dcast()，但似乎不起作用。
AGE Estimate_AGE REGION Estimate_REGION DRIVERS Estimate_DRIVERS
1 18-25 1.5 London 2 1 2.0
2 26-70 1.0 Southampton 3 2 …