我正在处理数据集，并希望分析数据集。我想进行DATE，国家/地区和人数的PCA。如何在R中生成此数据集的PCA图？我应该从哪里开始？我尝试了普通方法，但没有成功。数据集
03/17/2020 US 5
03/17/2020 Philippines 1
03/17/2020 Canada 14
03/17/2020 Romania 6
03/17/2020 Thailand 1
03/17/2020 Mainland China 0
03/17/2020 Indonesia 26
03/17/2020 Saudi Arabia 2
03/17/2020 Mainland China 1
03/17/2020 Hong Kong 4
03/17/2020 US 1
03/17/2020 US 0
03/17/2020 Iraq 5
03/17/2020 Mainland China 0
03/17/2020 US 444
03/17/2020 India 4
03/17/2020 Luxembourg 0
03/17/2020 Mainland China 1
03/17/2020 Mainland China 2
03/17/2020 Mainland China 0
03/17/2020 Kuwait 2
03/17/2020 Mainland China 1
03/17/2020 Lebanon 1