R语言中怎么计算某一列中变量种类以及每一个种类中的变量个数？

2024-07-06 10:13| 来源: 网络整理| 查看: 265

RT ACC experiment Type subject

1921 0 For-Time---1000 H 1

0 0 For-Time---1000 L 1

1515 1 For-Time---1000 H 1

2732 0 For-Time---1000 H 1

1400 1 For-Time---1000 H 1

1380 1 For-Time---1000 M1 2

1675 0 For-Time---1000 H 2

1274 0 For-Time---1000 M2 2

1237 1 For-Time---1000 L 2

1054 0 For-Time---1000 M1 2

985 1 For-Time---1000 L 3

851 1 For-Time---1000 H 3

1114 1 For-Time---1000 M2 3

1355 1 For-Time---1000 M2 3

1226 1 For-Time---1000 M1 3

例如我想从上边这些数据中得知subject中有几类数据（1,2,3.....）各自类别中有几个数据（如subject=1的有5个，=2的有5个诸如此类），该用怎么样的语句加以实现，谢谢各位帮助！

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