Statalist The Stata Listserver


[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

RE: st: RE: Easy question: How to get 0 to show up?


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: Easy question: How to get 0 to show up?
Date   Sun, 25 Jun 2006 19:22:59 +0100

To repeat: you cannot do this in -tabulate-. 

-tabcount- does not support percent calculations. 
That can be inferred by reading the help. 

But as anything that occurs with zero frequency 
also occurs with zero percent, regardless of 
whether you are thinking rowwise, columnwise, 
or tablewise, I have to say that adding that
calculation to -tabcount- has never been 
on my "to do" list as programmer, nor am 
I inclined to add it now. So, you would have
to edit your output tables if you want this
explicit. (Or clone -tabcount- and add that
to the program.) 

I don't know why -findit tabulate zero- 
did not work for you. 

My earlier message was in error in
overlooking Ben Jann's -mrtab-. 

Nick 
n.j.cox@durham.ac.uk 

buddyb
 
> Nick 
> 
> This is great.  And now I understand what findit is.
> I like the program you suggested...would this work in
> tabulate (I wanted to get Percent as well).  I did a
> findit tabulate zero without any luck.
 
Nick Cox <n.j.cox@durham.ac.uk> wrote:
 
> > The key question is how you expect Stata to 
> > know that "Green" was also a possible category. 
> > 
> > I guess that there are some languages in which
> > the fact that "Green" was 
> > defined as a possible value by way of a
> > specification 
> > of possible values would be enough. 
> > 
> > Stata doesn't work that way, however. Even if 
> > you define a set of value labels, Stata doesn't 
> > automatically tabulate those which are not 
> > represented in the data, or the subset of the 
> > data you specify. If these data are string, 
> > then why should Stata know that "Green" was 
> > a possible answer any more than (say) "Aardvark"?
> > 
> > So you need a work-around in which you yourself
> > spell 
> > out the possible values. The only ones I know
> > are -tabcount- from SSC and the earlier -tabcond-
> > from SSC. Note that had you used 
> > 
> > . findit zeros 
> > 
> > or 
> > 
> > . findit zero 
> > 
> > you would have found out about -tabcount- for 
> > yourself (together, naturally, with lots of 
> > other stuff). 
> > 
> > . findit tabulate zero 
> > 
> > would have zeroed in further on what you need. 
> > 
> > Here are a few simple examples of how -tabcount- 
> > works: 
> > 
> > . tabcount foreign, v(0 1 2 3 4)
> > 
> > ----------------------
> >  Car type |      Freq.
> > ----------+-----------
> >  Domestic |         52
> >   Foreign |         22
> >         2 |           
> >         3 |           
> >         4 |           
> > ----------------------
> > 
> > . tabcount foreign, v(0 1 2 3 4) zero
> > 
> > ----------------------
> >  Car type |      Freq.
> > ----------+-----------
> >  Domestic |         52
> >   Foreign |         22
> >         2 |          0
> >         3 |          0
> >         4 |          0
> > ----------------------
> > 
> > . decode foreign, gen(FOREIGN)
> > 
> > . tabcount FOREIGN , v("Domestic" "Foreign"
> > "Martian" "Venusian") zero
> > 
> > ----------------------
> >  Car type |      Freq.
> > ----------+-----------
> >  Domestic |         52
> >   Foreign |         22
> >   Martian |          0
> >  Venusian |          0
> > ----------------------
> > 
> > Missings are not shown by default. I guess the
> > reason 
> > you have a puzzle about missing is that you think
> > string 
> > "." means missing. With strings in Stata only the
> > empty string 
> > "" means missing. If you have strings "." that you 
> > regard as missing you should just exclude those if
> > desired 
> > by 
> > 
> > ... if COLOR != "." 
> > 
> > or replace them with empty strings. 
> > 
> > There was a more discursive account in the Stata
> > Journal  
> > 
> > SJ-3-4  pr0011  . . . . . . . .  Speaking Stata:
> > Problems with tables, Part II
> >         Q4/03   SJ 3(4):420--439                    
> >         
> >         reviews three user-written commands
> > (tabcount, makematrix,
> >         and groups) as different approaches to
> > tabulation problems
> > 
> > Nick 
> > n.j.cox@durham.ac.uk 
> > 
> > buddyb
> >  
> > > I'm running STATA 8.
> > > 
> > > If I had a multiple choice question, like, what is
> > > your favorite color with red, yellow, black, green
> > as
> > > the given choices,and asked 7 people and got the
> > > following results....
> > > 
> > > Red     1
> > > Yellow  2
> > > Black   3
> > > Green   0
> > >          . (missing)
> > > 
> > > When I do a Table COLOR (this is my vname),
> > > I get:
> > > 
> > > Red    1
> > > Yellow 2
> > > Black  3
> > > 
> > > The Green does not show up and I would like it
> > too. I
> > > want to repress the missing.  How do I do this? 
> >  

*
*   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/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index