identifying instruments

identifying instruments instruments 请问一下计量达人,identifying variables以及instruments是什么意思?后一个是工具变量吗?各 tax instruments identifying的意思 1.identifying sentence errors 英翻中,机翻勿扰：Identifying Collaborators identifying assumption是什么意思 Identifying descriptive words 帮忙翻译~~ 英语翻译hedging instruments, metex instruments是什么意思 musical instruments怎么读