重塑数据框 - 世界银行数据

Question

r-beginner，

有没有办法转换我拥有的表：

> dput(head(ed, 5))
structure(list(series = c("Government expenditure on education, total (% of GDP)", 
"Government expenditure on education, total (% of GDP)", "Government expenditure on education, total (% of GDP)", 
"Government expenditure on education, total (% of GDP)", "Government expenditure on education, total (% of GDP)"
), country = c("Afghanistan", "Afghanistan", "Afghanistan", "Afghanistan", 
"Afghanistan"), year = c("2000", "2001", "2002", "2003", "2004"
), Value = c(NA_character_, NA_character_, NA_character_, NA_character_, 
NA_character_)), .Names = c("series", "country", "year", "Value"
), row.names = c(NA, 5L), class = "data.frame")

以便来自df $ series的参数成为列名，用df $ Value填充值，而Country和Year保持固定看起来像这样：

Country     Year  GovernmentExpenditure   Population  LiteracyRate [otherparams]
Afghanistan 2000        10%                21979923        60%
Australia   2010        15%                21979923        90%

等

我尝试了dcast（），但它没有按照我想要的方式工作。

或者，有没有办法直接从世界银行数据中以必要的格式下载它？

谢谢！