Autotype specifies that newvar be the smallest type possible to hold the result. Note how the extension for Stata data is dta and also note how the new dataset has a different name from the original.
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Datasets come with codebooks.
. That is given 8 values average the 4th and 5th smallest values or given 42 average the 21st and 22nd smallestStigler1977 filled a much-needed gap. The command to save a dataset on Stata is save followed by the path where you want the dataset to be saved and the optional command replace. Become familiar with your dataset.
As Saad noted summary x d gives the mean as the 50th percentile. Medianexp autotype allows by varlist creates a constant within varlist containing the median of exp. Egen will also calculate medians and will do it by subgroups so if you need a variable with the median egen is easier.
The resulting type will be byte int long or double. You can access it if you need it using rp50. The convention of calculating the median of an even number of values by averaging the central two order statistics is of long standing.
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