# Stata count unique values

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Forvalues is, arguably, the easiest loop to write. It will only count sequences of numbers, so the variable that you are calling must include numeric values. You can write out forvalues or use the shortened forval command. You will need to distinguish how you want to count through the number sequence.|* Generate some data to illustrate. . clear . input byte month refer_id month refer_id 1. 1 1001 2. 1 1001 3. 1 1002 4. 1 1002 5. 2 1001 6. 2 1002 7. 2 1002 8. 2 1003 9. 3 1001 10. 3 1002 11. 3 1003 12. 3 1003 13. 4 1001 14. 4 1002 15. 4 1003 16. 4 1004 17. 4 1005 18. end . . | Jan 18, 2018 · In Stata, you can use the ... option names the variable count, and the nomiss option tells Stata to drop any observations that contain missing values. ... |separated values) and import it in Stata using the insheet command. In Excel go to File->Save as and save the Excel file as *.csv: Excel to Stata (using insheet) step 1 You may get the following messages, click OK and YES… Go to the next page… Excel to Stata (insheet using *.csv, - step 2)|Notes: 1. In the above formula, "Tom" is the name criteria, 2016,9,1 and 2016,9,30 are the two dates that you want to count based on, C2:C20 is the cells contains the name criteria, and D2:D20 is the cells contain the date, A2:A20 is the range of cells that you want to count the unique values. 2. If you need to use an "or" criteria to count the unique values, such as, calculate the ...| COUNT has the value 1 three times (i.e., has a Frequency of 3), meaning there are three single values. COUNT has the value 2 two times, meaning there are two duplicates. COUNT has the value 3 one time, meaning there is one triplicate. The two PROC FREQ steps count all occurrences (i.e., unique values, duplicates, triplicates, and so on,| separated values) and import it in Stata using the insheet command. In Excel go to File->Save as and save the Excel file as *.csv: Excel to Stata (using insheet) step 1 You may get the following messages, click OK and YES… Go to the next page… Excel to Stata (insheet using *.csv, - step 2)| The UNIQUE function in Excel can either count the number of distinct values in an array, or it can count the number of values appearing exactly once. UNIQUE accepts up to three arguments and the syntax is as follows: =UNIQUE(array, [by_col], [exactly_once]) Array is the range or array to be evaluated. By_col (optional argument) tells Excel ...|Example 3: Count Occurrences of Unique Values. To count how often each unique value occurs, you can first use the UNIQUE () function to display a list of unique team names: You can then use the COUNTIF () function to count how often each unique team name occurs in column A: Mavericks occurs 2 times. Hornets occurs 3 times.| Jan 18, 2018 · In Stata, you can use the ... option names the variable count, and the nomiss option tells Stata to drop any observations that contain missing values. ... | Here, xi is first used to let Stata know that you will want it to generate and use dummy variables in the regression. i.sex tells Stata that you want it to include a dummy variable for every unique value of sex (i.e. a dummy variable for male or female), and i.race indicates the same thing for race. As I understand your question you're actually not looking for a count of unique observations but rather for a count of unique values per character variable. If so then you have to scan the data set per variable. Luckily there are PROC's doing this for us - and they do it normally more efficient than we would code it.|. egen n = count(gpm) These egen functions handle any missing values automatically and can easily be combined with any extra if and in conditions. You may like to specify the unique option with rank()if you have many ties on your variable. If you want to t separate distributions to distinct groups, apply the by: pre x, say, |Missing values in stata are equivalent to infinity and thus will be sorted to the bottom of your sort if they exist *Example of points 1 and 2 above sysuse bplong, clear sort when patient sort patient when preserve replace when = . if _n == 25 sort when patient //where did the missing value get sorted to? restore|Count unique values with Pandas per groups - GeeksforGeeks › Discover The Best Online Courses www.geeksforgeeks.org Courses. Posted: (2 days ago) Feb 22, 2021 · Syntax: pandas.unique (df (column_name)) or df [‘column_name’].unique It will give the unique values present in that group/column. |j variable (3 values) -> year xij variables: anti90 anti92 anti94 -> anti self90 self92 self94 -> self pov90 pov92 pov94 -> pov ----- Note: The time-invariant variables are repeated across the multiple records for each child. The variable id has a unique ID number for each child. |Counting the number of distinct observations may be required at any point from initial data cleaning or checking to subsequent statistical analysis. We review how far existing commands in official Stata offer solutions to this issue, and we show how to answer questions about distinct observations from first principles by using the by prefix and ...|You can use the nunique() function to count the number of unique values in a pandas DataFrame.. This function uses the following basic syntax: #count unique values in each column df. nunique () #count unique values in each row df. nunique (axis= 1) . The following examples show how to use this function in practice with the following pandas DataFrame:|COUNT has the value 1 three times (i.e., has a Frequency of 3), meaning there are three single values. COUNT has the value 2 two times, meaning there are two duplicates. COUNT has the value 3 one time, meaning there is one triplicate. The two PROC FREQ steps count all occurrences (i.e., unique values, duplicates, triplicates, and so on,

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- Stata | FAQ: Number of distinct observations › Best Images the day at www.stata.com Images. Posted: (3 days ago) search distinct. to find the latest download location. The other commands are downloadable from the SSC archive using ssc specifically by typing . ssc inst egenmore (N.B.). ssc inst unique. distinct reports on distinct values, egen, nvals() computes their number in a new variable ...
- Count unique values with Pandas per groups - GeeksforGeeks › Discover The Best Online Courses www.geeksforgeeks.org Courses. Posted: (2 days ago) Feb 22, 2021 · Syntax: pandas.unique (df (column_name)) or df [‘column_name’].unique It will give the unique values present in that group/column.
- Oct 01, 2010 · The problem with using -tab- to count the unique number of values is its row limits: 12,000 rows (Stata/MP and Stata/SE), 3,000 rows (Stata/IC), or 500 rows (Small Stata). inspect varlist display r(N_unique) Besides reporting the number of unique values, -inspect- also reports: the number of negative, zero, positive, and missing values. It also draws a histogram. There is no need for r(N_unique) if the number of unique values is less than or equal to 99 as -inspect- reports the actual number.
- Count unique values with Pandas per groups - GeeksforGeeks › Discover The Best Online Courses www.geeksforgeeks.org Courses. Posted: (2 days ago) Feb 22, 2021 · Syntax: pandas.unique (df (column_name)) or df [‘column_name’].unique It will give the unique values present in that group/column.
- Microeconometrics using stata (Vol. 2). College Station, TX: Stata press.' and they indicate that it is essential that for panel data, OLS standard errors be corrected for clustering on the ...
- Multiply values in vx by b and add a, store results in vy: gen vy = a+ b * vx ; Generate a variable with all values 0: gen vone=0; Generate a variable with values 0 unless vtwo is greater than c, then make the value 1: gen vone=0 replace vone=1 if vtwo>c ; Random numbers. Set numbers of observations to n: set obs n
- display the unique values for rep78 Explore Data duplicates report finds all duplicate values in each variable ... count if price > 5000 count number of rows (observations) Can be combined with logic ... Stata has 6 data types, and data can also be missing: byte true/false int long float double numbers string
- The observations with missing values have to be deleted or the missing values have to be substituted in order for a statistical procedure to produce meaningful results. Most statistical programs (including SAS, SPSS, and Stata) will automatically remove such cases from any analysis you run (without deleting the cases from the dataset).
- If you need to calculate the unique values of materials, then I recommend the article: How to count unique values in Excel with criteria. I hope my advice will help you solve your task. Reply. Scott D says: October 14, 2021 at 5:04 pm. I imported two separate reports into either same sheet or different sheets. Each report have in separate ...
- This Stata FAQ shows how to check if a dataset has duplicate observations. There are two methods available for this task. The first example will use commands available in base Stata. The second example will use a user-written program. This user-written command is nice because it creates a variable that captures all the information needed to ...
- * Generate some data to illustrate. . clear . input byte month refer_id month refer_id 1. 1 1001 2. 1 1001 3. 1 1002 4. 1 1002 5. 2 1001 6. 2 1002 7. 2 1002 8. 2 1003 9. 3 1001 10. 3 1002 11. 3 1003 12. 3 1003 13. 4 1001 14. 4 1002 15. 4 1003 16. 4 1004 17. 4 1005 18. end . .
- Count unique values in Stata - Stack Overflow. codebook is a great command in Stata. It describes data contents but also simply identifies unique valuessysuse auto, clearcodebook mpg, compactNumber of unique values of mpg is 21. Looking at... Stack Overflow.
- Code: keep hospital type year drop if missing (hospital) duplicates drop collapse (count) hospital, by (type year) Note added: If hospital is a string variable, -collapse- will object that there is a type mismatch. In that case you need to first -encode- hospital and then substitute the encoded variable for hospital in the -collapse- command.
- 'Modeling Count Data is a well-organized entry-level book mainly written for applied researchers with little formal theoretical background in statistics who need to analyse count data … Thoroughly worked examples with software code, several of them devoted to applying alternative count models to the same data set, provide a basic guide for ...
- RE: st: Count of unique cases by group. Perfect. Thanks Nick! Your code has a number of additional insights (for me) in it over and above answering the questions. Best, Ben Ben Hoen LBNL Office: 845-758-1896 Cell: 718-812-7589 -----Original Message----- From: [email protected] [ mailto:[email protected]] On ...
- RE: st: Count of unique cases by group - Stata › Search The Best Images at www.stata.com. Images. Posted: (4 days ago) Jan 06, 2012 · RE: st: Count of unique cases by group. Perfect. Thanks Nick! Your code has a number of additional insights (for me) in it over and above answering the questions.
- Click Home > Conditional Formatting > Highlight Cells Rules > Duplicate Values. In the box next to values with, pick the formatting you want to apply to the duplicate values, and then click OK. Remove duplicate values. When you use the Remove Duplicates feature, the duplicate data will be permanently deleted.
- Building a unique ID in Stata using -concat-September 5, 2013 15 September, 2014. by [email protected] at 8:29pm 15 September, 2014. Someone asked me today how to create a unique ID from a dataset with four variables whose combination are unique. They're event data, sort of like this: country village year
- Building a unique ID in Stata using -concat-September 5, 2013 15 September, 2014. by [email protected] at 8:29pm 15 September, 2014. Someone asked me today how to create a unique ID from a dataset with four variables whose combination are unique. They're event data, sort of like this: country village year
- mum, maximum, median, any, all, distinct values, sorting, ranking 1 Introduction Stata's main data model is asymmetric. Your datasets consist of tables of data, but Stata regards the rows (observations) and columns (variables) of those tables diﬀerently. There is a command to summarize variables, for example, but no exact equivalent to
- Multiply values in vx by b and add a, store results in vy: gen vy = a+ b * vx ; Generate a variable with all values 0: gen vone=0; Generate a variable with values 0 unless vtwo is greater than c, then make the value 1: gen vone=0 replace vone=1 if vtwo>c ; Random numbers. Set numbers of observations to n: set obs n
- Stata tells us the values for a wide range of percentiles. The column Smallest and Largest denotes smallest and largest observations in this variable. The observations for count, mean, and ...
- Aug 17, 2015 · 17 Aug 2015, 08:07. Dear Statalisters, My panel data is organized by firm year industry. Below is a sample demo of my data. Question: how do I count the number of unique firms that have event_d dummy ==1? Expected results is 3 , for firm 1001, 1002, 1006. input firm str2 industry year event event_d. 1001 A 1998 0 1.
- Stata by and egen commands. by and bysort. Many Stata commands can be executed on a group-by-group basis. Earlier we looked at how the Stata by command can be used as a prefix for statistical commands (see help by). For example the following Stata code will execute the summarize command for each unique value of marital (married, widowed, etc.):
- RE: st: Count of unique cases by group. Perfect. Thanks Nick! Your code has a number of additional insights (for me) in it over and above answering the questions. Best, Ben Ben Hoen LBNL Office: 845-758-1896 Cell: 718-812-7589 -----Original Message----- From: [email protected] [ mailto:[email protected]] On ...

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- the unique values of the variable in question, even though such distinct values could all be repeated in the data—and, in particular, 2, 3, and 4 are indeed repeated. One logic behind that terminology is that if you remove all the duplicates from these data, then you are left with four distinct values, each of which occurs once. The
- Count unique values in Stata. Ask Question Asked 5 years, 5 months ago. Active 5 months ago. Viewed 21k times 5 3. codebook is a great command in Stata. It describes data contents but also simply identifies unique values. sysuse auto, clear codebook mpg, compact Number of unique values of mpg is 21. ...