请问一下大家 我在140步当开头时运行出现问题 (note: you are using old merge syntax; see [D] merge for new syntax)
variable code does not uniquely identify observations in the master data
你好 我想请问一下 我在140步当开头时运行出现问题 (note: you are using old merge syntax; see [D] merge for new syntax)
variable code does not uniquely identify observations in the master data