-3
如何在R和Department and Year分组中绘制此图,时间为x轴,计数为y轴?并有连接线和颜色相同的群体如何绘制R中的2个分组变量?
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