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Observation limits stata mp11/15/2022 ![]() ![]() From the output we can see: The value 9 occurs 3 times. The varlist may include both numeric and string variables. Another way to do it: gen ZZ = 0 qui forval i = 1 /`=_N' display `counter' Note: this is exactly what's done by the count command. Many Stata commands can be executed on a group-by-group basis. describe produces a summary of the dataset, including its storage type, display format, value label and variable label. 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 () #display sorted values points array() Find and Count Unique Values in a Column The command unique without a by reports the number of unique values for the varlist. Third, make full use of by: together with nand N. The Stata result screen will show the result of this action: number of observations deleted. 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. bysort x y: generate count = (_n=1) by x:replace count = sum (count) by y:replace count= count (N) Other method: egen tag = tag (x y) 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. Stata shows missing values as dots if you view a dataset with the browse command. Each agency has a unique ID display the unique values for rep78 Explore Data _N creates a running count of the total observations per group Stata has 6 data types, and data can also be forvalues is used to loop over consecutive values. ![]() The Creating a variable equal to the count of unique values across varlist for each observation I have data with a bunch of different date fields that may or may not contain the same information. ) Having created the new variable dup, you could then. input firm str2 industry year event event_d. value_counts () 9 3 7 2 5 1 12 1 4 1 Name: assists, dtype: int64. We will use this file for showing how to collapse data across observations. count if price > 5000 count number of missing/unique values Stata has 6 data types, and data can also be missing: byte true/false display the unique values for rep78 Explore Data _N creates a running count of the total observations per group Stata has 6 data types, and data can also be If my panel data contain studies appended from 10 different data sets, there are certain variables which shows duplicate values if I calculate incidence or prevalence of an event. First, de ne indicator variables that mark the beginning of each spell. Stata count unique values Counting with by. ![]()
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