stata里面下面程序是什么意思呀?sort CODE DATE by CODE:egen sd_INCOME=sd(INCOME) by CODE:egen mea

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stata里面下面程序是什么意思呀?sort CODE DATE by CODE:egen sd_INCOME=sd(INCOME) by CODE:egen mea

stata里面下面程序是什么意思呀?sort CODE DATE by CODE:egen sd_INCOME=sd(INCOME) by CODE:egen mea
stata里面下面程序是什么意思呀?sort CODE DATE by CODE:egen sd_INCOME=sd(INCOME) by CODE:egen mea

stata里面下面程序是什么意思呀?sort CODE DATE by CODE:egen sd_INCOME=sd(INCOME) by CODE:egen mea
sort CODE DATE /*按CODE DATE排序*/
by CODE: egen sd_INCOME=sd(INCOME) /*按CODE分类对INCOME求标准误*/
by CODE: egen mea /*这一句语法错误,应该还没写完*/