Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

st:graph mean with missing groups


From   Amanda Fu <mandy.fu1@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st:graph mean with missing groups
Date   Fri, 13 Jul 2012 20:13:20 -0400

Hi All,

I am stuck with drawing a graph about means of a test score variable
by groups. The problem is caused by there are some "empty" groups.

The variable "score" range from 0 to 100. I cut it into 10 bands : 0,
1-10, 11-20,21-30,...,91-100. I create a new variable "score_percent"
indicates the percent for the share of observations in each band.
The data set is like:
id   score   score_percent
1      32           3.8         (Totally 3.8% observations have scores
between 31-40)
2      89         23.4
3      67         16.5
...................
I tried to use the following command to create a graph for mean level
of test scores:
.twoway connected   score_percent    score ,xlabel(0(10)100)
-------------------------
However, in the data set none observations have scores from 11-20. So
this is an empty band. The value of "score_percent" for this band
should be 0. But if I use the above command to draw the graph, the
connected line will skip the empty band and directly jump to the next
point (it is like, along the x-axis there are band 0-10, 21-30,.....).
What I wanted is to give the empty band with percent share is 0.
I wonder if someone can give me some suggestion how to fix this. Thank you!

Amanda
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   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   |   Site index