Using Stata for Survey Data Analysis

save [filename] [, replace ] 
If you do not give a file name, it will use the current name. 
You cannot write over an old file unless you specify “replace” (unlike in SPSS). 
if option 
This is not a command, but an option for many Stata commands. The if option carries out the 
command only for the records that satisfy some condition. This is similar to the “process if” 
command in SPSS, except that in Stata it is not a separate command. The syntax is:
command if exp 
Examples include:

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Using Stata for Survey Data Analysis 
 
Minot 
 
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list hh_size if dzongkha<4 
lists all household sizes for dzongkhags 1, 2, and 3 
tab hh_size if stratum==2
gives number of rural households of each size
  sum b21_q3ag if b21_q1==2 
gives statistics on age for female-headed households
Note that “if” statements always use two equal symbols (==), not just one. Also note that | indicates 
“or” while & indicates “and”.
 
in  
This is not a command, but an option for many Stata commands. The in option carries out a command 
only for records selected by the case number. The syntax is: 
command in exp 
For example: 
list hh_size in 10
give the value of hh_size in observation number 10 
summarize in 10/20 
give mean, minimum, and maximum of all variables for observations 
10-20 .
help
The help command gives you information about any Stata command or topic 
help command 
For example,
help tabulate
gives a description of the tabulate command 
help summarize
gives a description of the summarize command 
set 
The set command is used to control the Stata operating environment. There are dozens of set 
commands, but many of them are rarely used. Some of the more common ones are: 
set mem XXm sets memory for Stata at XX megabytes. If you get the error message “No room to 
add more observations”, this means the data file is too big for the memory allocated to Stata. This 
command increases the memory allocated to Stata. You cannot set XX greater than the total RAM 
memory in the computer – physical and virtual memory.