Web使用 "duplicates drop id year,force" 能剔除多余的重复值。但使用过程中,一定要注意区分报表类型带来的影响,下载数据中包含有合并报表和母公司报表;我们的研究对象一 … WebMar 20, 2024 · 关于duplicates drop, force的一点疑问,当出现冗余观测值时,我们是不是可以用duplicates drop var1 var2, force这个命令?那么留下的是默认排序之后遇到的第一个变量吗?还是随机地删除??比较困惑,求解!!,经管之家(原人大经济论坛)
How can I detect duplicate observations? Stata FAQ
WebAug 21, 2015 · duplicates drop gvkey cyq, force. drop dup . sort gvkey datadate */ save fundq_nodup, replace. Please note: I also agree with one of the readers’ comments that “(how to remove duplicates) depends on what you need”. For example, in one of my projects, I want to look at three-day CAR around earnings announcement date (RDQ) … Webduplicates caused by using a KEEP or DROP data set option. SORT BY ALL THE VARIABLES If you put every variable in the BY list, the problem probably won’t occur, because duplicate observations will be adjacent when PROC SORT checks for duplicates. An easy way to sort by every variable is to put the special keyword _ALL_ at the end of … bone china made in england tea cups
Chapter 5 Data Manipulation Introduction to Stata - CSCAR
WebApr 11, 2024 · Bill Summary. The bill modifies the "Uniform Election Code of 1992" (code), the law regarding initiatives and referendums, and the "Fair Campaign Practices Act". Elections generally. The bill allows any form of identification currently specified in the code to be presented in digital format. Qualification and registration of electors. WebAnother method to deduplicate data might be to delete rows based on one or more columns that you identify as a primary key for the dataset. A primary key is an identifier that … WebJan 23, 2024 · Both snippets that you posted should be removing the rows with Unique values for county. I would make a small correction to your snippet by assigning the variable: non_unique_data = data [data.groupby ('county') ['county'].transform ('size') > 1] Same with your second snippet. You'll see that it's only kept the data with duplicate values in county. goat cheese appetizer balls