The duplicates command can list and flag duplicate observations. You can check for duplicate observations in Stata in the following ways: The isid command can detect duplicate observations. Detect duplicate observations in a data set in Stata.
Stata missing values code#
Thanks Nick! Your code has a number of additional insights (for me) in it over and above answering the questions.
unique It will give the unique values present in that group/column. Syntax: pandas.unique (df (column_name)) or df.sysuse auto, clear codebook mpg, …Ĭount unique values with Pandas per groups - GeeksforGeeks › Discover The Best Online Courses Courses. codebook is a great command in Stata.It describes data contents but also simply identifies unique values. Posted: (1 day ago) Count unique values in Stata.Ask Question Asked 5 years, 5 months ago. Count unique values in Stata - Stack Overflow › See more all of the best images on Images.In the opening Select Duplicate & Unique Cells dialog box, check the Duplicates (Except 1st one) option or All duplicates (Including 1st one) option as you need, and click the Ok button. Select the column or list that you will count all duplicates, and click the Kutools > Select > Select Duplicates & Unique Cells. 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 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.Here, we want to know the number of unique values of the variable year. I'll demonstrate it with an example using the Stata dataset uslifeexp. So, we are going to use the r-class returned results from tab command. If the number of unique values is large, it becomes difficult to count them manually. It describes data contents but also simply identifies unique valuessysuse auto, clearcodebook mpg, compactNumber of unique values of mpg is 21. Count unique values in Stata - Stack Overflow. 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. 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. 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).sort group score by group: generate n1 = _n by group: generate n2 = _N list score group id nt n1 n2 1. Of course, to use the by command we must first sort our data on the by variable. Using _n and _N in conjunction with the by command can produce some very useful results. 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. Example 3: Count Occurrences of Unique Values.If you want to t separate distributions to distinct groups, apply the by: pre x, say, You may like to specify the unique option with rank()if you have many ties on your variable. egen n = count(gpm) These egen functions handle any missing values automatically and can easily be combined with any extra if and in conditions. October, 2017)/Rect/Subj(Typewritten Text)/Subtype/FreeText/T(otorres)/Type/Annot>endobj512 0 objendobj513 0 obj/ProcSet>/Subtype/Form/Type/XObject>streamĮndstreamendobj514 0 objendobj515 0 objendobj516 0 objstream
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