Answer: The average age of married respondents over the age of 25 is 43.84.
To obtain this answer we again need to use the means command to produce the average value of the age variable, in addition to a qualifier, which will restrict the calculation to married respondents that are over the age of 25. To do this we type the following in Stata:
means age if marstat == 1 & age > 25 & age~=.
The above command produces the following table:
Variable | Type Obs Mean [95% Conf. Interval]
-------------+----------------------------------------------------------
age | Arithmetic 563 43.84192 43.0164 44.66743
| Geometric 563 42.68772 41.87 43.52142
| Harmonic 563 41.5261 40.71983 42.36494
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From the table we can see that the average age of married respondents over the age of 25 in the sample is 44 years old.