Xiaoheng Zhang asked three questions:
1.Could I speicfy a precision level to certain digit for
the outcome? Say 4-digit after decimal point?
The answer depends on the command.
You can specify a fixed format for a variable, e.g.
format var1 %7.4f
This has effect for -list-, for labels on graph axes,
for -ci- and -tabulate, summarize()-, but not for most
other commands. (I think this is fine for -list- and graph
axes, but quite bad for -ci- and -tabulate, summarize()-).
For some commands, e.g. -table- and -tabstat- you may specify
the output format by command options, e.g.
table ... , format(%7.4f)
For most commands, I believe, you cannot really control the
precision level displayed.
------------------------------------------------------------
2.Could STATA display 0 before decimal point for the outcome?
Command dependent as above:
format var1 %06.4f
table ... , format(%06.4f)
------------------------------------------------------------
3.How to use "if" for the string variables. For example, I have
a variable "nationality" having two values-EU or US. How can I
construct a condition started with if,like "if nationality==EU"?
... if nationality=="EU"
------------------------------------------------------------
Hope this helps
Svend
________________________________________________________
Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6
DK-8000 Aarhus C, Denmark
Phone, work: +45 8942 6090
Phone, home: +45 8693 7796
Fax: +45 8613 1580
E-mail: [email protected]
_________________________________________________________
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
