我有一个名为IMS的数据集,由11个变量组成. 强文
我想为变量pi == 1的所有观测计算变量std.y的平均值.
谁能告诉我如何计算这个？:)
最诚挚的问候,亨里克
mean(IMS$std.y[IMS$pi==1])
This is something you can get from most introductory texts on R - I'd recommend you look through those before posting questions here.