Cluster sampling

Cluster sampling is done as follows:

Here is the Stata code to perform cluster sampling:

The output of this command will be as follows:

#Obs per Unit
---------------------------------------------------
Stratum    #Units    #Obs    min    mean    max
--------  --------  ------  -----  ------  --------
1          286      286      1      6.1     100
--------  --------  ------  -----  ------  --------
1          286      286      1      6.1     100
---------------------------------------------------

Here is the code for the mean of the estimation sample:

The output of this code will be as follows:

--------------------------------------------------------------
             |             Linearized
             |  Mean     Std. Err.     [95% Conf. Interval]
-------------+------------------------------------------------
Fridge_sales |560.5404   18.08756      540.1245    590.0987
volume       |31.98367   2.983672      25.98367    40.00098
--------------------------------------------...