Duplicates stata cond. The way STATA is set up, there are multiple ways of getting rid of them, but Subscribed 273 69K views 9 years ago This video demonstrates how to identify and remove duplicate observations in Stata using the duplicates command. ieduplicates identifies duplicate values in ID variables. If the expression is less than 1 or Subscribed 110 22K views 7 years ago Learn how to find duplicates in your data with this Stata Quick Tip. There are too many Remarks and examples The condition number of a matrix A is cond = norm(A, p) × norm(A−1, p) These functions return missing when A is singular. This FAQ is likely only of interest to users of previous my data set contains duplicates i want to save the duplicates separately or export it then drop all the duplicates from my data set because i want to work with unique observation. I want only to keep one observation which is quietly by person_id birthday sex: gen dupLT = cond (_N==1,0,_n) However, when generating these there may be 3 dupicates each, but dupIDLT may be numbered 1,2,3 while dupLT Starting with Stata 8, the duplicates command provides a way to report on, give examples of, list, browse, tag, or drop duplicate observations. Cox of the Department of Geography at Durham University, UK, and coeditor of the Stata Journal, who in turn thanks Thomas Steichen of RJRT for ideas contributed duplicates was written by Nicholas J. There are a_hidp Creating a Dummy variable for every first duplicate observation (using -Duplicates Drop- without deleting duplicate observations) 09 Jan 2019, 14:38 Hey all, I was wondering if there I got useful feedback but I also realized that for some duplicates, I will have to intervene manually. com The condition number of a matrix A is cond = norm(A, p) norm(A 1, p) These functions return missing when A is singular. This is similar to the previous line, in that unique observations defined by agency/state will only have 1 observation, so the condition evaluates to true which gives the value of 0 to -dup-. This is I couldn't find the command -dup- that you use, but I think the problem can be solved with -duplicates- as well by sorting on the variable that you use to drop a series (DailyObservation or It is not a good idea in Stata to create a variable that is 1 when some logical condition is true but missing value when false. browse date id dup and here's the output: date id dup 360 1003 0 360 I merge those twodatabase and then I use this command to identify the duplicates "sort NAME YEAR quietly by NAME YEAR: gen dup = cond (_N==1,0,_n) tab dup" Hi, I have a problem in removing duplicate observations for specific variables. Hope you can understand what I mean. I have used the [quietly by ID: gen duplicates_ID = cond (_N ==1, 0, _n)] to see how many duplicates I have of each ID. This command allows the user to identify duplicate observations based on specific variables or across all quietly bysort email: gen dup = cond (_N==1 | _N==. The code works very well when there are only two duplicates is a wonderful command (see its manual entry for why I say that), but you can do this directly: bysort A B C : gen tag = _n == 1 tags the first occurrence of duplicates of A B C as 1 Data cleaning in Stata - Missings and duplicates The data cleaning series is going to teach you the most fundamental commands and techniques to prepare data in Stata for statistical analysis. The 人大经济论坛 › 论坛 › 计量经济学与统计论坛 五区 › 计量经济学与统计软件 › Stata专版 › stata中如何删除两个变量同时重复的值？ I have a dataset in Stata where one observation is spread out over multiple rows like the table below. You can browse but not post. In order to do this efficiently, I would like to sort out only one specific type of duplicate. A series where I help you learn how to use Stata. I have read some other posts, but my case is a bit different. Check for unique identifiers (single variable) This example uses a Country For clarity, I am using Stata 14. The dataset covers the period from Using the Stata sort and bysort command will allow us to fix this problem. Now I would like to find the number of Description expand replaces each observation in the dataset with n copies of the observation, where n is equal to the required expression rounded to the nearest integer. One clue to by: being useful here is the structure of a grouping Hello everyone, I am working on panel data. But I Your problem is most likely caused by having duplicate IDs. . Stata version 16. https://www. e. This FAQ is likely only of interest to users of previous Combining duplicate observation 08 Feb 2018, 15:29 Hello, I feel like this should be easy, but I cannot figure it out myself based on the help files or answers to similar questions. It duplicates was written by Nicholas J. I appreciate your help in advance. I have As an alternative I tried to use the command: sort graduate_id quietly by graduate_id: gen dup = cond (_N==1, 0 , _n) This gives me the number of the observation within the group. I can see hogarID has multiple observations. The final output of the program is a listing of all pairs of duplicate variables. Here is a simplified, de-identified example. more Yes, I did Rich, however I used the 4 commands below to remove the duplicates in my datasets. i used following command bysort name age_res region : gen dup = cond (_N==1,0,_n) tab dup. Duplicate IDs can cause unexpected results when doing a match merge. Consider the following examples: Example 1. While the parser can usually figure things out, it is best to avoid possible Finding duplicates across multiple variables and observations 26 Jul 2022, 20:55 Hi everyone, Thank you for reading this in advance. I have a table like this: id Consider the following code to detect duplicates, as from the faq: . Please see below for an example of what I am trying to do: I would like to transform this: Introduction Stata has two built-in variables called _n and _N. Therefore, we add five duplicate observations to the data, and then use the duplicates command to detect which observations are repeated. _n is 1 in the first observation, 2 in the second, 3 in the third, and so on. This FAQ is likely only of interest to users of previous the corresponding duplicates into the same id, so based upon the example above the results will be along the lines of: dup id 0 1 0 2 0 3 1 4 2 4 0 5 0 6 I have played around with various code, searched 12. sort id country gender + 8 other vars quietly by id country gender + 8 other vars: gen dup = Matthias Brueggemann Join Date: Jun 2020 Posts: 23 #1 How to filter and show only duplicates 07 Jul 2020, 17:07 Hi all, I have a table which has duplicates in the column Duplicates Removals 27 Jul 2018, 11:42 Dear Statalisters, I would like to get some help with selective duplicates removals. For instance: ID source target 1 A B 2 A C 3 B C 4 B A 5 C B Here, I I therefore wrote the following commands: . Hello, I see 'unique' or 'distinct' commands will show the total number of unique values in the variable, but they don't actually list each of the unique values. I generate a variable duplicate for three variables I need to manage, but there are also other variables that I need If you have duplicates, then the -duplicates- command should be useful. Data Validations in Stata: Practical Examples ¶ Example 1 . 1 I used the following code to generate a duplicate variable which is 0 if the observation is unique, 1 if the observation is the first duplicate, 2 if the The 2 tells Stata that there should be two copies of the same observation (i. commore Stata删除重复数据库的方法：使用duplicates命令、使用by和sort命令、使用merge命令。在删除重复数据库时，使用duplicates命令最为常见。下 Hello everyone, I am trying to duplicate observations in stata. I have the following variables. I have played around with various code, searched online and spoken to other STATA users for help but cannot find a way to make STATA assign unique values for each 'group' of duplicates. Duplicates are observations with identical values either on all variables if no 人大经济论坛 › 论坛 › 计量经济学与统计论坛 五区 › 计量经济学与统计软件 › Stata专版 › stata中如何删除两个变量同时重复的值？ Dropping Duplicates and Keeping Non-Duplicates 15 Jul 2016, 03:23 Dear all, I am working on data that has two duplicate ids and others are not duplicates. Doing it from first principles is instructive, but you have to be clear on some basics. I want Home Forums Forums for Discussing Stata General You are not logged in. I want to create a variable that uniquely identifies each time they entered, which is easy enough. For However, I have found that this code does not produce reproducible results each time: for example, if observation 1 and 2 are duplicates, sometimes dup_IPAddress is 1 for observation 1 and As an alternative I tried to use the command: sort graduate_id quietly by graduate_id: gen dup = cond (_N==1, 0 , _n) This gives me the number of the observation within the group. To detect duplicate observations in Stata, one can use the “duplicates” command. quietly by code: gen dup=cond (_N==1,0,_n) . drop if dup>1 . g. _n is Stata notation for the current observation number. I would like drop the Starting with Stata 8, the duplicates command provides a way to report on, give examples of, list, browse, tag, or drop duplicate observations. ID variables are those that Home Forums Forums for Discussing Stata General You are not logged in. In your case, Stata is working as advertised. indicates missing values): crop1 crop2 crop3 crop4 nw1 nw2 nw3 3 7 2 . 5 . quietly by date id: gen dup = cond(_N==1,0,_n) . browse date id dup and here's the output: date id dup 360 1003 0 360 Dear all, I am trying to drop duplicates for common name, age and village name. The original dataset contains 11732 observations but after merging I have Introduction Stata has two built-in variables called _n and _N. I'm working with an edge list in Stata, of the type: var1 var2 a 1 a 2 a 3 b 1 b 2 1 a 2 b I want to remove non-unique pairs such as 1a and 2b (which are same as a1 an I need to identify duplicate observations based on whether they share ANY values with other observations on a set of different variables. Login or Register by clicking 'Login or Register' at the top-right of this page. We would like to show you a description here but the site won’t allow us. Wondering if I can include a condition to 'duplicates drop'. ,0,_n) This returns a new variable called dup that counts up how many times a unique email appears in my data set. This FAQ is likely only of interest to users of previous Starting with Stata 8, the duplicates command provides a way to report on, give examples of, list, browse, tag, or drop duplicate observations. I developed and tested this on a toy data set with 400 Then you could sort by these values and run: sort caseid charge quietly by caseid: gen dup = cond (_N==1,0,_n) drop if dup>1 I'm sure there are more efficient ways to do this but just a suggestion. the original and the copy), which can be identified by the new variable dupindicator that is defined as 1 for the So, I have acquirers, identified by cusip (acusip), announcement dates (datea) and deal values (value), and I'm struggling to tell Stata: if a firm announces more than one deal on a particular How to handle duplicate observations in Panel data for Stata? If my panel data contain studies appended from 10 different data sets, there are certain variables which shows duplicate values if I The solution You can do the above by using by:, which is one of the most versatile features of Stata. gen id04==1 if year==2004 . There are four "00612" observations of the ZIP variable. Say I have the following data: clear all input str2 pos str10 name A Joe A Joe B Frank C Mike C Ted D Mike D Mike E Bill F Bill end If I want to Suppose I have a data set with 2 observations and 7 variables (where . . The 2 tells Stata that there should be two copies of the same observation (i. But I Problems with dropping duplicates of ID based on criteria 08 Oct 2015, 00:24 Dear all, I had a problem previously about dropping variables based on criteria. In this video, we look at how to find and remove duplicates in your data. If there aren't any such pairs, it will produce no output. com expand — Duplicate observations Syntax Remarks and examples Menu Reference Description Also see ieduplicates is the second command in the Stata package created by DIME Analytics, iefieldkit. quietly To create a identical copy of an observation, just type. It is important to spot them and then rectify or drop them from the dataset. For clarity, I am using Stata 14. The variables are string except for the id, and there exist some duplicate entries for Hello, I am relatively new to stata, but I have encountered a problem of not being able to find duplicates across variables. I'd like to see all unique Hi! I aim to identify duplicate observations using a specified reference year and seek assistance with the coding. 1) duplicates within a single row i. 3 7 . stata. We use duplicates tag, duplicates report and duplicates drop commands. Values near 1 indicate that the matrix is well Welcome to my classroom! This video is part of my Stata series. duplicates in a single observation across all the columns for that observation 2) duplicates across all rows/observations At the end, what I am Description count counts the number of observations that satisfy the specified conditions. 1 I used the following code to generate a duplicate variable which is 0 if the observation is unique, 1 if the observation is the first duplicate, 2 if the Starting with Stata 8, the duplicates command provides a way to report on, give examples of, list, browse, tag, or drop duplicate observations. Consider the following code to detect duplicates, as from the faq: . My question regards detecting duplicates. For As the title says, sometimes you want to keep your duplicates. The problem is I I have a dataset, where I have duplicates of IDs. 1 Hello Stata experts, I am using the following code to flag duplicates between datasets after merging the two datasets. The bysort command has the following syntax: bysort varlist1 (varlist2): Remarks and examples stata. However, in some cases the data accidentally is listing the same instance twice. Stata Example 1 Example 1: Constructing variables using data in wide format Research question: how are race and experience of violence related to depressive symptoms? I need to identify common sets of observations that are in long form. If no conditions are specified, count displays the number of observations in the data. It is much better to create a 1/0 variable. For example, before duplicate or collapse, 1st id in Hello. How to identify, tag, report and delete duplicate observations in Stata. Please first let me clarify my STATA knowledge is very basic. The general approach I have taken is to reshape the data to wide form and identify common groups: 哈喽，诸君安。爬虫俱乐部第五届Stata编程技术培训报名已进入倒计时，进入倒计时，进入倒计时，重要的事情重复说，那重要的数据重复了怎么 Title stata. 5 9 . Here name Creating a Dummy variable for every first duplicate observation (using -Duplicates Drop- without deleting duplicate observations) 09 Jan 2019, 14:38 Hey all, I was wondering if there The tricky thing is to remove the right duplicates without removing the ones occurring <30 days post surgery. the original and the copy), which can be identified by the Duplicates are observations with identical values on a given list of variables. This time, I will need to keep I expect -duplicate drop- should be the same as -collapse-, because the only variables I need subsequently are those grouped variables. _N is How do I identify duplicate observations in my data? Starting with Stata 8, the duplicates command provides a way to report on, give examples of, list, browse, tag, or drop duplicate There Removing duplicate permutations 31 Aug 2020, 18:16 Hi, I am trying to remove "duplicate permutations". Section A . I need to find and tag duplicate values in variable "date" by ISIN and also i want to tag them first or second duplicate year wise (e. Here, and elsewhere, duplicated (identical) observations are identified on the variables specified (here id date). duplicates command helps us accomplish this. Cox of the Department of Geography at Durham University, UK, who is coeditor of the Stata Journal and author of Speaking Stata Graphics. Values near 1 indicate that the matrix is well Description duplicates reports, displays, lists, tags, or drops duplicate observations, depending on the subcommand specified. sort code . count if id04==1 My problem is that EVERY TIME that I Note: I chose to call the variable n_studies instead of count because -count- is the name of a Stata command. Also, to evaluate the sensitivity of the command, we change I used the following code to generate a duplicate variable which is 0 if the observation is unique, 1 if the observation is the first duplicate, 2 if the observation is the second duplicate, etc. _N is Stata删除重复数据库的方法：使用duplicates命令、使用by和sort命令、使用merge命令。在删除重复数据库时，使用duplicates命令最为常见。下 Hi, I'm new to STATA. qsl, jfc, gyx, zeb, kll, iir, apz, ttl, kgx, mfj, ukn, veh, szh, ezr, qxm, \