R 练习
练习
我们为每个 R 章节收集了各种 R 练习（附答案）。
尝试通过编辑一些代码来解决练习，或者查看答案以了解你做错了什么。
计算你的得分
每个正确答案得 1 分。你的得分和总分将始终显示。
如果你不了解 R，我们建议你从头阅读我们的 R 教程。
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