Stata drop duplicates
The command drops all observations except the first occurrence Now, we can use the duplicates drop command to drop the duplicate We correct the scores, andĪfter the correction, the results from duplicates report and duplicates
Were incorrect, and the real score was 44. From this, it would be advisable to check which Math scores over the duplicate observations. It is apparent that id = 1 has different values on New variable dup_id that assigns a 1 if the id isĭuplicated, and 0 if it appears once. Like that given from duplicates list, we use the duplicates tag command to create a The duplicates list and duplicates list id outputs. The other variables to see which variables are causing the difference between Now we see which five subjects are duplicated however, the duplicate list only lists the variable specified. This duplicates list corresponds to listing those observations withĭuplicate rows however, as found with duplicates report, it does not | group: obs: id female ses read write math | Next we list duplicate observations with the duplicates listĬommand. (copies), which leads to a total of 10 questionable observations based on Unique id values, and five ids (surplus) that appear two times each Second command duplicates report id shows that we have 195 The same, and this command correctly did not pick them up.
Note that in the duplicate whose value we changed (id=1), the two rows are not technically The duplicates report output shows the number of replicate rows over all variables. The duplicates examples command lists one example of each duplicatedĬlearly, the output from duplicates report and duplicates We could have used the duplicates examplesĬommand. Which gives the number of replicate rows by the variables specified This is followed by duplicate reports id, The duplicates report command to see the number of duplicate rows in For subject id =1, all of her values are duplicated exceptįor her math score one duplicate score is set to 84. This leads to 195 unique and 5 duplicated observations in theĭataset. To add the duplicate observations, we sort the data by id, thenĭuplicate the first five observations (id = 1 to 5). Happen in practice we often search for "duplicate" cases that are not The rationale for changing a value is to mimic what may Also, to evaluate the sensitivity of theĭuplicate observations. The data, and then use the duplicates command to detect which Therefore, we add five duplicate observations to This example uses the High School and Beyond dataset, which has noĭuplicate observations. This user-written command is niceīecause it creates a variable that captures all the information needed to The secondĮxample will use a user-written program. Theįirst example will use commands available in base Stata. There are two methods available for this task.
#Stata drop duplicates how to
First, we are going to create a dictionary and then we use pd.Dataframe() to create a Pandas dataframe.This Stata FAQ shows how to check if a dataset has duplicate In this section, of the Pandas drop_duplicates() tutorial, we are going to create a Pandas dataframe from a dictionary. Now, updating pip is quite easy using conda or pip.
#Stata drop duplicates install
That said, now we can continue the Pandas drop duplicates tutorial.Īt times, when we install Python packages, we may also notice that we need to update pip.
#Stata drop duplicates upgrade
Note, this post explains how to install, use, and upgrade Python packages using pip or conda. Obviously, if we want to use Pyjanitor, we also need to install it: pip install pyjanitor. If we install Anaconda, for instance, we’ll also get Pandas. Python can be installed by downloaded here or by installing a Python distribution such as Anaconda or Canopy.