我对R很陌生,我有一个很大的数据集,我想为每个人重复一个特定的单元格。请看下面的子集:
dfX <- data.frame("picode" = c(1,1,1,1,1,1,2,2,2,2,2,2,3,3,4,4,4,4,4,5,6,6,6,6),
"Age" = c(0,7,14,21,28,30,0,7,14,21,28,30,0,8,0,8,15,21,29,0,0,5,7,14),
"IUGRsc1" = c(0.12,NA,NA,NA,NA,NA,0.26,NA,NA,NA,NA,NA,0.15,NA,0.19,NA,