-3
如何在R和Department and Year分組中繪製此圖,時間爲x軸,計數爲y軸?並有連接線和顏色相同的羣體如何繪製R中的2個分組變量?
Department Year Counts Time
1 CPD 2011 24 0
2 CPD 2011 28 1
3 CPD 2011 31 2
4 APD 2012 20 0
5 APD 2012 25 2
6 APD 2012 21 3
7 CPD 2012 30 2
8 CPD 2012 26 3
9 CPD 2012 11 5