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st: RE: bar graph problem


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: bar graph problem
Date   Wed, 30 Apr 2008 14:52:42 +0100

There are several questions here. Your bottom line as I understand it 
is that you want -graph bar- to show you counts or frequencies. 
That isn't what -graph bar (asis)- does at all. It shows the raw data. 
"asis" means "as is". 

It doesn't count for you. 

If you want bars of counts, then -contract- the data first. Alternatively, 
look at -catplot- on SSC. 

For example, if I read in  

. sysuse auto, clear 

And ask for 

. graph bar (asis) foreign, over(rep78)
variables rep78 _variables do not uniquely identify the observations
r(459);

I get the same kind of message. What you may want instead is something more like 

. catplot bar foreign rep78 

Or 

. catplot bar rep78 foreign  

See also 

<http://www.stata-journal.com/sjpdf.html?articlenum=gr0004> 

for more discussion. 

The various error messages you get are not especially comprehensible. 
Although it is not very helpful to say so, the best way to consider them 
is as indicating that Stata is having difficulty making sense of your instruction. 
As you appear to be expecting something that -graph bar- doesn't promise to
do, that is likely to be the root of the problem. 

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

Tunga Kantarci

I use the following command to generate a categorized bar graph:

graph bar (asis) q41a if grandom == 1, over(frandom_)

However, I receive the following message:

variables frandom_ _variables do not uniquely identify the observations

I don't understand why my "frandom_" variable need to identify the
observations uniquely.
(by the way I have an "id" variable which uniquely identifies observations)
I also do not understand what "_variables" refers to.

If I run the command without "asis" then I get the following:

graph bar q41a if grandom == 1, over(frandom_) variable __000006 not found
in using data

In particular, what I am trying to do is this: see the three tabulations
below. What I want is a categorized bar graph, where the categorization is
over frandom. That is, three bars in a bunch will present together "Plan van
name5", where each bar refers to one of the "frandom"s. There will be three
bunches with each bunch having three bars. But unfortunately, I receive the
message I mentioned.  
 
 tab q41a if grandom == 1 & frandom == 1
             q4 age |
randomisation 1 3/4 |      Freq.     Percent        Cum.
--------------------+-----------------------------------
plan van ^name5 |         21       42.00       42.00
plan van ^name6 |         14       28.00       70.00
plan van ^name7 |         15       30.00      100.00
--------------------+-----------------------------------
              Total |         50      100.00
 
 tab q41a if grandom == 1 & frandom == 2
             q4 age |
randomisation 1 3/4 |      Freq.     Percent        Cum.
--------------------+-----------------------------------
plan van ^name5 |         32       61.54       61.54
plan van ^name6 |         10       19.23       80.77
plan van ^name7 |         10       19.23      100.00
--------------------+-----------------------------------
              Total |         52      100.00
 

 tab q41a if grandom == 1 & frandom == 3
             q4 age |
randomisation 1 3/4 |      Freq.     Percent        Cum.
--------------------+-----------------------------------
plan van ^name5 |         23       58.97       58.97
plan van ^name6 |          4       10.26       69.23
plan van ^name7 |         12       30.77      100.00
--------------------+-----------------------------------
              Total |         39      100.00

tab frandom

         q4 |
 (standard) |
       item |
randomizati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        627       34.19       34.19
          2 |        600       32.72       66.90
          3 |        607       33.10      100.00
------------+-----------------------------------
      Total |      1,834      100.00


tab grandom

         q4 |
 (standard) |
       item |
randomizati |
 on pension |
     income |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        465       25.35       25.35
          2 |        478       26.06       51.42
          3 |        452       24.65       76.06
          4 |        439       23.94      100.00
------------+-----------------------------------
      Total |      1,834      100.00



 tab q41a

             q4 age |
randomisation 1 3/4 |      Freq.     Percent        Cum.
--------------------+-----------------------------------
Plan from ^name5 |        220       52.26       52.26
Plan from ^name6 |         53       12.59       64.85
Plan from ^name7 |        148       35.15      100.00
--------------------+-----------------------------------
              Total |        421      100.00

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