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在R中，使用dplyr，我有一个数据表，它具有独立变量性别和政党，以及因变量薪金。我可以找到男性/女性和劳工与保守党的平均薪水，但我想要保守党男子，保守党妇女，劳工男子和劳工妇女的平均薪水。我怎么弄到的？R程序和平均打印结果
我： 工党保守党
Male Female Male Female
£30,000 £27,000 £25,000 £23,000
£26,000 £19,000 £24,500 £27,000
£28,000 £23,000 £26,000 £21,000
£35,000 £22,000 £31,000 £22,000
£35,000 £21,000 £27,000 £30,000
£37,000 £20,000 £30,000 £30,000
我需要这样的东西：
gender party mean(salary)
1 female labour 27833.33
2 female tory 23000.00
3 male labour 27250.00
4 male tory 31166.67