I can't comment on SPSS, which I believe to
be another program.
But there is no need for hunch or surmise.
Even if you haven't got a manual to hand, a good
introduction to Stata's approach to missing values
is provided by
. help missing
In essence you can map those large negative
values to specially coded missing values of your choice,
after which you can, I imagine, emulate
anything reasonable that your other program produces
fairly closely.
Nick
[email protected]
Graham Wright
> I'm trying to use stata to produce a weighted codebook of a large
> dataset. Just a lot of one way tabs in survey mode. However,
> I'm having
> trouble getting the missing values to work the way I would like.
> The data was originally coded in SPSS, and missing values
> were expressed as large negative numbers (-999 etc) and given
> different
> labels depending on why the data is missing ("Refused," "Question not
> asked" etc). Naturally, when I run frequency commands in SPSS I get
> relative frequencies for the valid data only, but I get to see the
> missing values too. However, since we're using a complex
> sample design,
> I need to use stata to get the correct confidence intervals,
> but as far
> as I can tell, the only value that stata will accept as missing is a
> period, anything else gets included in the analysis, so I can't
> differentiate between different kinds of missing values, like
> I can in
> SPSS. Is there a way to get an SPSS style output (valid,
> missing & valid
> percent, total percent) in Stata? My hunch is that you simply
> can't do
> this in Stata but maybe someone knows a way.
*
* 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/
